Allen&Heath XB-14-2 User Manual

USER GUIDE

Publication AP8769

Limited One Year Warranty

This product is warranted to be free from defects in materials or
workmanship for period of one year from the date of purchase by the
original owner.

To ensure a high level of performance and reliability for which this
equipment has been designed and manufactured, read this User Guide
before operating. In the event of a failure, notify and return the
defective unit to ALLEN & HEATH Limited or its authorised agent as
soon as possible for repair under warranty subject to the following
conditions

Conditions Of Warranty

The equipment has been installed and operated in accordance with the
instructions in this User Guide.

The equipment has not been subject to misuse either intended or
accidental, neglect, or alteration other than as described in the User
Guide or Service Manual, or approved by ALLEN & HEATH.

Any necessary adjustment, alteration or repair has been carried out by
ALLEN & HEATH or its authorised agent.

This warranty does not cover fader wear and tear.
The defective unit is to be returned carriage prepaid to ALLEN &

HEATH or its authorised agent with proof of purchase.
Units returned should be packed to avoid transit damage.
In certain territories the terms may vary. Check with your ALLEN &

HEATH agent for any additional warranty which may apply.

This product complies with the European Electromagnetic Compatibility directive 2004/108/EC
and the European Low Voltage directive 2006/95/EC.

This product has been tested to EN55103 Parts 1 & 2 2009 for use in
Environments E1, E2, E3, and E4 to demonstrate compliance with the
protection requirements in the European EMC directive 2004/108/EC.
During some tests the specified performance figures of the product were
affected. This is considered permissible and the product has been passed as
acceptable for its intended use. Allen & Heath has a strict policy of
ensuring all products are tested to the latest safety and EMC standards.
Customers requiring more information about EMC and safety issues can
contact Allen & Heath.

NOTE: Any changes or modifications to the console not approved by
Allen & Heath could void the compliance of the console and therefore the
users authority to operate it.

Allen & Heath XB-14 MK2 User Guide AP8769 Issue 2

Copyright © 2012 Allen & Heath Limited. All rights reserved

Allen & Heath Limited

Kernick Industrial Estate, Penryn, Cornwall, TR10 9LU, UK

http://www.allen-heath.com

Allen & Heath 3 XB-14 MK2 User Guide

PACKED ITEMS

Check that you have received the following:

MIX B OUT

CRM SPEAKERS

ST4

L

R

L/M

ST3

R

0

5

+15

3/4 5/ USB

0

5

+15

PRE

=

PFL

PGM
FDR

0

5

10

15

20

30

40
50
OO

AUD OUT

INSERT L

L

L

L

R

R

L/MRL/M

ST5

ST7

R

ST6

0

USB

5

SEND

-15

RETURN

AUX+MONO

+15

ST6 (USB)

AUDITION

USB SOURCE SELECT

MIX B

ST5

0

0

ST5

ST7

5

5

-15

-15

+15

+15

HF

HF

12kHz

12kHz

-15 +15

-15 +15

LF

LF

80Hz

80Hz

-15 +15

-15 +15

PRE

PRE

OO +6

OO +6

=

=

BAL

BAL

LR

LR

PEAK

PEAK

SIGNAL

SIGNAL

PFL

PFL

PGM

PGM

FDR

FDR

0

0

5

5

10

10

15

15

20

20

30

30

40

40

50

50

OO

OO

ST4

R

INSERT R

EXT MON IN

L

AUX

R

GUEST PHONES 1 GUEST PHONES 2 CRM PHONES

POWER

+16

48V

+9
+6

ON

+3

0VU

-3

PGM MIX

-6

-9

-12

-16

-20

-30

L

R

PFL ACTIVE

AUD

AUX

EXT
MON

USB
IN

CRM+PHONES

MIX B

SELECTION

CRM

SPEAKERS

MIN MAX

DIM SPKS

CUT SPKS

MIC FADER UP

=CUT SPKS

CRM
PHONES

MIN MAX

MIN MAX

MIN MAX

MIX B LEV

EX MON

PGM MIX

FADER
0

5

10

15

20

30

40
50
OO

PGM

L
MAIN

PGM
OUT

R

MONO

OUT

+16
+9
+6
+3

0VU

-3

-6

-9

-12

-16

-20

-30

&

ALLEN HEATH

GUEST PHONES

SELECTION

PFL ENABLE

TO GUEST

TALK

TO GUEST

GUEST
PHONES

MIN MAX

MIN MAX

AUD

MIC MIC

LINE LINE

LINE LINE

M1

M1 M2 M3 M4 T1 T2

0

10

20

30

10

GAIN

0

40

MIC

50

LINE

-6-10 63 26

100Hz

HF

12kHz

-15

+15

650

500 1k

200

2k
3k

120Hz 4k

-15MF+15

LF

80Hz

-15 +15

PRE

AUX

OO +6

MIX B
BUS BUS BUS BUS BUS BUS BUS BUS BUS BUS

=

PAN

LR

AUD AUD AUD AUD AUD AUD AUD AUD AUD AUD

REM MUTE REM MUTE REM MUTE REM MUTE

PEAK
SIGNAL

PFL

PGM
FDR

0

5

10

15

20

30

40
50
OO

M1 M2 M3 M4 ST1 S T2 ST3

M4

M3

INSERT

INSERTM2INSERT

INSERT

0

0

0

10

10

10

20

20

20

30

30

30

10

10

10

GAIN

GAIN

GAIN

0

0

0

40

40

40

MIC

MIC

MIC

50

50

50

LINE

LINE

LINE

-6-10 63 26

-6-10 63 26

-6-10 63 26

100Hz

100Hz

100Hz

HF

HF

HF

12kHz

12kHz

12kHz

-15

-15

-15

+15

+15

+15

650

650

650

500 1k

500 1k

500 1k

200

200

200

2k

2k

2k
3k

3k

3k

120Hz 4k

120Hz 4k

120Hz 4k

-15MF+15

-15MF+15

-15MF+15

LF

LF

LF

80Hz

80Hz

80Hz

-15 +15

-15 +15

-15 +15

PRE

PRE

PRE

AUXAUXAUXAUXAUXAUXAUXAUXAUX

OO +6

OO +6

OO +6

MIX B MIX B MIX B MIX B MIX B MIX B MIX B MIX B MIX B

=

=

=

PAN

PAN

PAN

LR

LR

LR

PEAK

PEAK

PEAK

SIGNAL

SIGNAL

SIGNAL

PFL

PFL

PFL

PGM

PGM

PGM

FDR

FDR

FDR

0

0

0

5

5

5

10

10

10

15

15

15

20

20

20

30

30

30

40

40

40

50

50

50

OO

OO

OO

CLF OUT

TELCO 1

0

GAIN GAIN

-5

-1O 26

120Hz

HPF

20Hz 6kHz

3k

LPF

700Hz 20k

AUDITION

CLF SCE

OO +6

=

PAN

LR

REM MUTE REM MUTE

PEAK
SIGNAL

5

10

20

AUX AUX

PRE

PFL

PGM
FDR

0

5

10

15

20

30

40
50
OO

T1

L

R

CLF OUT

L/M

ST1

R

TELCO 2

ST2

0

5

0

10

5

-5

-15

20

-1O 26

+15

ST2

120Hz

1/2

HPF

ST1

20Hz 6kHz

0

3k

ST1

5

-15

LPF

700Hz 20k

+15

HF

12kHz

TALKTALK

-15 +15

AUDITION

LF

CLF SCE

80Hz

-15 +15

PGMPGM

PRE

PRE

OO +6

OO +6

=

=

PAN

BAL

LR

LR

+START/CUE +START/CUE +START/CUE +START/CUE

PEAK

PEAK

SIGNAL

SIGNAL

PFL

PFL

PGM

PGM

FDR

FDR

0

0

5

5

10

10

15

15

20

20

30

30

40

40

50

50

OO

OO

T2

ST4

-15

ST4

ST3

ST3

-15

HF

12kHz

-15 +15

LF

80Hz

-15 +15

OO +6

BAL

LR

PEAK
SIGNAL

ST2

TEL IN

TEL IN

MIC MIC

Mains Lead (or leads)
Check that the correct

mains plug is fitted.

XB-14 MK2 MIXER

This User Guide

Type A-B USB Lead
To connect the XB-14 to

your computer.

Allen & Heath 4 XB-14 MK2 User Guide

SAFETY INSTRUCTIONS

WARNINGS - Read the following before proceeding :

CAUTI ON

ATTENTION: RISQUE DE CHOC ELECTRIQUE – NE PAS OUVRIR

Read instructions: Retain these safety and operating instructions for future reference. Adhere to all warnings printed here
Do not remove cover: Operate the console with its covers correctly fitted.

Power sources: Connect the console to a mains power unit only of the type described in this User Guide an d marked

Power cord routing: Route the power cord so that it is not likely to be walked on, stretched or pinched by items placed

and on the console. Follow the operating instructions printed in this User Guide.

on the rear panel. Use the power cord with sealed mains plug appropriate for your local mains supply
as provided with the console. If the provided plug does not fit into your outlet consult your service
agent for assistance.

upon or against it.

Grounding: Do not defeat the grounding and polarisation means of the power cord plug. Do not remove or tamper

with the ground connection in the power cord.

!

WARNING: This equipment must be earthed.

Water and moisture:

To reduce the ri sk of fire or electric shock do not expose the console to rain or moisture or use it in

damp or wet conditions. Do not place containers of liquids on it which might spill into any openings.

Ventilation: Do not obstruct the ventilation slots or position the console where the air flow required for ventilation is

impeded. If the console is to be operated in a rack unit or flightcase ensure that it is constructed to
allow adequate ventilation.

Heat and vibration: Do not locate the console in a place subject to excessive heat or direct sunlight as this could be a fire

hazard. Locate the console away from any equipment which produces heat or causes excessive vibra­tion.

Servicing: Switch off the equipment and unplug the power cord immediately if it is exposed to moisture, spilled

liquid, objects fallen into the openings, the power cord or plug become damaged, during lightening
storms, or if smoke, odour or noise is noticed. Refer servicing to qualified technical personnel only.

Installation: Install the console in accordance with the instructions printed in this User Guide. Do not connect the

output of power amplifiers directly to the console. Use audio connectors and plugs only for their in­tended purpose.

Allen & Heath 5 XB-14 MK2 User Guide



SAFETY INSTRUCTIONS

Important Mains plug wiring instructions

The console is supplied with a moulded mains plug fitted to the AC
mains power lead. Follow the instructions below if the mains plug has to
be replaced. The wires in the mains lead are coloured in accordance
with the following code:

TERMINAL WIRE COLOUR

European USA/Canada

LIVE BROWN BLACK

L

!

NEUTRAL BLUE WHITE

N

EARTH GND GREEN & YELLOW

E

GREEN

The wire which is coloured Green and Yellow must be connected to the
terminal in the plug which is marked with the letter E or with the Earth sym­bol. This appliance must be earthed.
The wire which is coloured Blue must be connected to the terminal in the
plug which is marked with the letter N.
The wire which is coloured Brown must be connected to the terminal in the
plug which is marked with the letter L.
Ensure that these colour codes are followed carefully in the event of the
plug being changed.

General Precautions:

Damage : To prevent damage to the controls and cosmetics avoid placing heavy

Environment : Protect from excessive dirt, dust, heat and vibration when operating

Cleaning : Avoid the use of chemicals, abrasives or solvents. The control panel is

Transporting : The console may be transported as a free-standing unit or mounted in

Hearing : To avoid damage to your hearing do not operate any sound system at exces-



objects on the control surface, scratching the surface with sharp objects, or
rough handling and vibration.

and storing. Avoid tobacco ash, smoke, drinks spillage, and exposure to rain
and moisture. If the console becomes wet, switch off and remove mains pow­er immediately. Allow to dry out thoroughly before using again.

best cleaned with a soft brush and dry lint-free cloth. The faders, switch es and
potentiometers are lubricated for life. The use of electrical lubricants on these
parts is not recommended. The fader and potentiometer knobs may be re­moved for cleaning with a warm soapy solution. Rinse and allow to dry fully
before refitting them.

a rack or flightcase. Protect the controls from damage during transit. Use
adequate packing if you need to ship the unit.

sively high volume. This applies particularly to close-to-ear monitoring such as
headphones and in-ear systems. Continued exposure to high volume sound
can cause frequency selective or wide range hearing loss.

Allen & Heath 6 XB-14 MK2 User Guide

CONTENTS

Thank you for purchasing your Allen & Heath XB-14 mixer. To ensure
that you get the maximum benefit from the unit please spare a few
minutes familiarizing yourself with the controls and setup procedures
outlined in this user guide. For further information please refer to the
additional information available on our web site, or contact our technical
support team.

http://www.allen-heath.com

http://www.allen-heath.com/xb

W arranty .............................................. 3

Packed Items ........................................ 4

Safety Instructions .............................. 5

Contents ............................................... 7

Panel Drawings .................................... 8

Introduction to XB-14 ....................... 9

Specifications ....................................... 11

Dimensions .......................................... 13

Block Diagram ..................................... 14

Mono Input Channel .......................... 15

TELCO Channels 1&2 ....................... 18

Stereo Input Channel ST1 & ST2 .... 21

Stereo Input Channels ST3 & ST4 .. 23

Master Section .................................... 24

Remote Interface connectors .......... 27

On Switch Options ............................ 28

Remote Interface wiring ................... 29

USB Connecting to a Computer .... 30

Application Diagram—Self Op ........ 31

Application Diagram—Studio .......... 32

Tips– off-air recording ....................... 33

Fixing into a Rack or furniture ........ 34

General wiring notes ......................... 35

Product Support ................................. 36

Service Options .................................. 37

Allen & Heath 7 XB-14 MK2 User Guide

PANEL DRAWINGS

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

AVIS: RI SQUE DE CHOC E LEC TRIQUE - NE PAS OUVRIR.
CAUTION: FOR CONTINUED PROTECTI ON AGAINST RI SK OF FIRE
ATTENTION: REMPLA CER PAR UN FUSIB LE STRICTEM ENT IDENTIQUE EN VALEURS .
REFER SER VICING TO QUALIFIED SERVICE PERSONNEL.
WARNING: THIS APPARATUS MUST BE EARTHED
Laite on liitettävä su ojamaadoituskoskettimilla varustettuun pistorasiaan
Apparatet må tilkoples jordet stikkontakt
Apparaten skall anslutas till jord at uttag

OFF

ON

0 I

ENGINEERED IN ENGLAND BY ALLEN & HEATH LIMITED. MADE IN CHI NA

MIC MIC

LINE LINE

M1

INSERT

M1 M2 M3 M4 T1 T2

0

0

10

20

30

GAIN

MIC

LINE

HF

12kHz

200

LF

80Hz

AUX

PAN

10

0

-6-10 63 26

-15
500

120Hz 4k

-15MF+15

-15 +15

OO +6

LR

10

GAIN

0

40

MIC

50

LINE

-6-10 63 26

100Hz

HF

12kHz

+15

-15

650

1k

500

200

2k

3k

120Hz 4k

-15MF+15

LF

80Hz

-15 +15

PRE

AUX AUX AUX AUX A UX AUX A UX AUX AUX

OO +6

MIX B
BUS BUS BUS BUS BUS BUS BUS BUS BUS BUS

=

PAN

LR

This dev ice complies with Part 15 of the FCC Rules.
Ope ration is subject to the followin g tw o co n diti ons:

(1) thi s device may not cause harmful interference, and
(2) this device mu st accept any interference received ,
including int erference that may cause undesired operation.

REPLACE FUSE WITH SAME TYPE AND RATING.

CET APPAREIL DOIT ETRE MI S A LA TERR E

AC MAINS IN ~

100 - 240V~ 47-63Hz 30W

FUSE

T1.0A L 250V 20m m

Serial No.

MIC MIC

LINE LINE

M3

M2

INSE RT

INSE RT

0

10

10

20

20

30

+15

650

PRE

MIX B MIX B MIX B MIX B MIX B MIX B MIX B MIX B MIX B

=

30

10

GAIN

0

40

MIC

50

LINE

-6-10 63 26

100Hz

100Hz

HF

12kHz

+15

-15
650

1k

1k

500

200

2k

3k

120Hz 4k

-15MF+15

LF

80Hz

-15 +15

PRE

OO +6

=

PAN

LR

M4

INSE RT

0

10

20

30

10

GAIN

0

40

40

MIC

50

50

LINE

-6-10 63 26

100Hz

HF

12kHz

+15

-15
650

1k

500

200

2k

3k

LF

80Hz

PAN

120Hz 4k

-15MF+15

-15 +15

PRE

OO +6

=

LR

2k

3k

ALLEN&HEATH

CONFORMS TO ANSI/UL STD. 6006 5-2003

CERTIFICATED TO CAN /CSA STD.60065-03

ST2

TEL IN

CLF OUT

TELCO 1

5

0

GAIN GAIN

10

-5

20

-1O

26

120Hz

HPF

20Hz 6 kHz

3k

LPF

700Hz 20k

AUDITION

CLF SCE

AUX AUX

PRE

OO +6

=

PAN

LR

HPF

LPF

CLF SCE

PAN

TEL IN

CLF OUT

TELCO 2

0

-5

-1O

120Hz

20Hz 6 kHz

700Hz 20k

TALKTALK

OO +6

LR

ST1

ST2

0

5

10

-15

20

26

ST2

ST1

PGMPGM

=

AUDITION

0

ST1

-15

HF

12kHz

-15 +15

LF

80Hz

-15 +15

PRE

OO +6

=

BAL

LR

3k

ST4

L

R

L/M

L

R

L/M

ST3

R

R

ST4

0

5

+15

1/2

5

+15

PRE

-15

ST3

-15

HF

12kHz

LF

80Hz

BAL

ST4

ST3

-15 +15

-15 +15

OO +6

LR

5

+15

3/4 5/USB

0

5

+15

PRE

=

AUD AUD AUD AUD AU D AUD AUD AU D AUD AUD

REM MUTE REM MUTE REM MUTE REM MUTE

PEAK
SIGNAL

PEAK

PEAK

SIGNAL

PFL

PGM
FDR

0

5

10

15

20

SIGNAL

PFL

PGM
FDR

0

5

10

15

20

PEAK
SIGNAL

PFL

PGM
FDR

0

5

10

15

20

PFL

PGM
FDR

0

5

10

15

20

REM MUTE REM MUTE

PEAK
SIGNAL

PEAK
SIGNAL

PFL

PGM
FDR

0

5

10

15

20

+START/CUE +START/CUE +START/CUE +START/CUE

PEAK

PEAK

SIGNAL

PFL

PGM
FDR

0

5

10

15

20

SIGNAL

PFL

PFL

PGM

PGM

FDR

FDR

0

5

10

15

20

0

5

10

15

20

ST6

-15

ST5

-15

HF

12kHz

LF

80Hz

BAL

MIX B OUT

ST5

0

+15

ST6 ( USB)

ST5

0

+15

-15 +15

-15 +15

PRE

OO +6

=

LR

PEAK
SIGNAL

PFL

PGM
FDR

L

R

L/M

R

5

5

0

5

10

15

20

CRM SPEAKERS

RETURN

USB SOURCE SELEC T

ST7

-15

HF

12kHz

-15 +15

LF

80Hz

-15 +15

BAL

PEAK
SIGNAL

L

R

L/M

ST7

R

AUX+ MONO

AUDITION

MIX B

0

+15

PRE

OO +6

=

LR

PFL

PGM
FDR

USB

SEND

5

0

5

10

15

20

EXT METER

AUD OUT

EXT MON I N

GUEST PHONES 1

48V

ON

PGM MIX

CRM+ PHONES

DIM SPKS

CUT SPKS

MIC FADER UP
=CU T SPKS

MIN MAX

EX MON

REMOTE A

REMOTE B

INSERT L

L

R

INSERT R

L

AUX

R

GUEST PHONES 2 CRM PHON E S

POWER

+16
+9
+6
+3

L

PFL ACTIVE

SELECTION

CRM

SPEAKERS

MIN MAX

CRM

PHONES

MIN MAX

MIN MAX

MIX B LEV

SETUP OPTION SWITCHES

(SEE USER MA NUAL)

+16
+9
+6
+3

0VU

-3

-3

-6

-6

-9

-9

-12

-12

-16

-16

-20

-20

-30

-30

R

AUD

AUX

EXT
MON

USB

IN

MIX B

MIN MAX

MIN MAX

AUD

PGM MIX

FADER

0

5

10

15

20

MONO

OUT

0VU

GUEST P HONES

SELECTION

PFL ENABLE
TO GUES T

TALK

TO GUEST

GUEST
PHONE S

L

MAIN
PGM

OUT

R

&

ALLEN HEATH

30

30

40

40

50

50

OO

OO

M1 M2 M3 M4 ST1 ST2 ST3

30

30

30

40

40
50
OO

40

50

50

OO

OO

T1

30

40
50
OO

30

40
50
OO

30

40
50
OO

T2

30

40
50
OO

30

40
50
OO

ST4

30

40
50
OO

PGM

Allen & Heath 8 XB-14 MK2 User Guide

INTRODUCTION TO THE XB-14

Background overview:

The Allen & Heath XB-14 mixer has been carefully and lovingly designed in the beautiful county of Cornwall in the UK and is manufac­tured alongside a wide range of professional audio mixing consoles. Many of the components used in the XB-14 are exactly the same as in
the larger Allen & Heath products and the construction methods are also very similar utilising individual vertically mounted channel circuit
boards with each rotary control fixed with a metal nut to the front panel. This provides a very robust product that will resist damage and
give years of reliable use. It also makes servicing much easier should it be required, with the ability to remove one particular channel from
the mixer at a time, or easily change a fader.

The audio circuitry is based on years of continual development and refinement , the performance of all the elements within the mixer
scrutinised and perfected to ensure the very best sound quality possible.

Multi-application:

The XB-14 is great for a range of applications from small radio or internet broadcast studios, or for larger studios with multiple rooms,
for hospital radio, university radio and community radio broadcast applications. The XB-14 has a wealth of features specifically designed
for broadcasters, things like telephone communication modules for telephone callers, mic fader start sensing for external connection and
internal automatic muting of the speaker outputs, stereo channel start/cue outputs for CD deck transport control, separate headphones
mix & outputs for guests, an audition bus…. The list goes on!

Mic/Line Pre-amps:

The XB-14 pre-amps use a two stage design, with carefully controlled amounts of gain in each stage. When amplifying the signal from the
XLR input, the gain range is huge (69dB of range to be exact) and is very evenly distributed around the gain control, meaning better con­trol of signal level. Most of the gain comes from the first stage, so unwanted noise is kept to a minimum. There is no “pad” switch, or pad
circuit — line level signals are simply plugged into the second stage of the pre-amp by using the line input jack socket. This has the great
advantage of lower noise when using the line input. (It is common to attenuate line level signals, then amplify them back up again which can
give more noise or hiss).

EQ:

The XB-14 is equipped with a 3-band equaliser circuit on each mono input which can be used to cut sibilance or mic popping or to
change the tone of a presenters voice. The telco channels are fitted with a total cut high pass and low pass filter which can be used to
eliminate the top or bottom end of the channel frequency response. This can be very useful when a caller is connected via a low quality
telephone line. Stereo channels have high and low frequency tone controls for use with music.

AUX bus:

XB-14 has a single Auxiliary bus that can be used for external processing, effects, recording or auditioning.

MIX B:

A separate stereo mix bus is provided for recording an independent mix to the main program mix, or creating a clean feed source with
selected channels.

Audition bus:

The XB-14 has a dedicated stereo audition bus that can be used for auditioning or off air recording. Pressing the button marked AUD on
the channels required, transfers the mix from the program feed over to the audition bus.

Channel signal/peak indicators:

Each channel on the XB-14 has an indicator to show if there is signal present. This is pre fader / ON switch so the operator can be aware
of channels that are active. The peak LED also gives a warning if a channel is in danger of exceeding its peak level.

Remote Control:

The mono mic/line channels have fader start logic switching enabling them to control external equipment or automatically mute the speak­er outputs to prevent acoustic feedback in localised or self-operated applications. The stereo channels have start & cue logic outputs avail­able to hook up to external equipment like CD players. There are also options to mute the mono inputs remotely using an external
“cough” switch or similar.

Allen & Heath 9 XB-14 MK2 User Guide

INTRODUCTION TO THE XB-14

USB:

Getting audio to and from a computer easily is now a common requirement for sound and music production and broadcast applications.
The way we have implemented this on XB-14 is super-flexible and super-easy! No longer do you need to fiddle around the back of your
computer to get to the soundcard inputs, only to find that the levels are all wrong and noisy. Just plug in a USB lead to your XB-14, select
the USB routing on the mixer and the device on your computer and that’s it! Quality audio to and from your PC or MAC.

Guest headphones:

The XB-14 has 3 headphone outputs. There is a headphones socket for the presenter/engineer with a routing matrix. There are two guest
headphone outputs with a separate routing matrix. There is also a talk button for off air conversation with guests via the user selected
comms mic channel.

Output matrix:

Both the operator and guest headphone outputs (and the control room speakers) have an output matrix with priority switched feeds. This
means the operator could be monitoring one bus while a guest is listening to the program mix. There are many possible combinations.

Electronically balanced outputs:

The main program outputs are on XLR connectors with an electronically balanced output circuit.

Self operation or Producer operated:

Whether you need a mixer for a self operated broadcast situation, or whether you have a separate studio and engineer, the XB-14 has
the features to fit. Separate monitor mixes can be created for operator and guests or presenter so the engineer can check levels and cue
sources while the presenter or guest can listen to a different source. The engineer/producer can communicate to the guest or presenter
using the Talk feature, as well as off-air communication to telephone callers.
There is also the facility for remote control of channel mutes from the studio using the remote interface connectors, ideal for studio situ­ated mute switches.

Allen & Heath 10 XB-14 MK2 User Guide

SPECIFICATIONS

Operating Levels

Input

Mono channel Mic input (XLR) +6 to –63dBu for nominal (+17dBu in max)
Mono channel Line input (TRS Jack socket) +10 to –26dBu (+30dBu maximum)
Insert point (TRS Jack socket) 0dBu nominal +21dBu maximum
Stereo input (TRS Jack sockets) 0dBu nominal (control = Off to +10dB)
Stereo input (RCA phono sockets) 0dBu nominal (control = Off to +10dB)
Telco channel input (XLR) +10 to –26dBu (+30dBu maximum)
External monitor inputs (RCA phono sockets) 0dBu Nominal

Output

PGM L & R outputs (XLR) +4dBu nominal. +25dBu maximum.
PGM Mono output (RCA phono) 0dBu nominal. +21dBu maximum.
PGM L & R inserts (TRS jack sockets) -2dBu nominal. +21dBu maximum
Aux output (Jack socket) 0dBu nominal. +21dBu maximum.
Mix B outputs (RCA phono sockets) 0dBu nominal. +21dBu maximum.
Audition outputs (RCA phono sockets) 0dBu nominal. +21dBu maximum.

Telco output (XLR) 0dBu nominal. +21dBu maximum.
CRM Speaker outputs (RCA phono sockets) 0dBu nominal. +21dBu maximum.

THD+n

Mic in to PGM L/R Out, 0dB gain, 1kHz, +10dBu out <0.01%
Mic in to PGM Out, 30dB gain, 1kHz, +10dBu out <0.01%
Line in to PGM L/R out 0dB gain, 1kHz, 0dBu out <0.01%
Stereo in to PGM out 0dB gain, 1kHz, +10dBu out <0.01%

USB Audio CODEC (Coder/Decoder)

USB Audio In/Out USB 1.1 compliant 16bit.
Sample Rate 32, 44.1, or 48kHz

Noise

Mic Pre EIN @ max gain 150R input Z 22-22kHz -124dBu
PGM out, PGM fader = 0, 22-22kHz < -100dBu
Audition out, Mix B out = 0, 22-22kHz < -100dBu
Aux out, Mono out = 0, 22-22kHz < -85dBu

Allen & Heath 11 XB-14 MK2 User Guide

SPECIFICATIONS

Headroom

Analogue Headroom from nominal (0Vu) Outputs 21dB
Analogue Headroom from nominal (0Vu) Mix point 24dB
USB in & out headroom from nominal (0Vu) 14dB

Crosstalk & Attenuation (dB 22-22kHz)

Mono fader attenuation (dB relative to +10dBu) 1kHz/10kHz -95/-95
Mono ON switch attenuation (dB relative to +10dBu) 1kHz/10kHz -95/-95
TELCO fader attenuation (dB relative to +10dBu) 1kHz/10kHz -95/-95
TELCO ON switch attenuation (dB relative to +10dBu) 1kHz/10kHz -95/-95
Stereo fader attenuation (dB relative to +10dBu) 1kHz/10kHz -95/-90

Stereo ON switch attenuation (dB relative to +10dBu) 1kHz/10kHz -95/-95
PGM fader attenuation (dB relative to +10dBu) 1kHz/10kHz -100/-95
TELCO clean-feed isolation from I/P (dB relative to +10dBu) 1kH z/10kHz -55/-40
Stereo separation, L in to PGM R out. dBr 1kHz/10kHz -70/-50

Frequency Response

Mic in to PGM L/R Out, 30dB gain +0.5/-1dB 10Hz to 30kHz.
Line in to PGM L/R out 0dB gain +0.5/-1dB 10Hz to 30kHz
Stereo in to PGM L/R out +0.5/-1dB 10Hz to 30kHz

Allen & Heath 12 XB-14 MK2 User Guide

Dimensions

MIX B OUT

CRM SPEAKERS

L

R

L/MRL/M

ST5

0

5

RETURN

+15

0

ST7

5

+15

12kHz

80Hz

PRE

BAL

PFL

PGM
FDR

0

5

10

15

20

30

40
50
OO

HF

LF

USB SOURCE SELECT

-15

-15 + 15

-15 + 15

PEAK
SIGNAL

ST7

0

PRE

OO +6

=

LR

PFL

ST4

AUX+M ONO

AUDITION

MIX B

+15

PGM
FDR

L

R

R

USB

SEND

5

0

5

10

15

20

30

40
50
OO

AUD OUT

INSE RT L

L

R

INSE RT R

EXT MON IN

L

AUX

R

GUEST PHONES 1 GUEST PHONES 2 CRM PHONES

POWER

+16

48V

+9
+6

ON

+3

0VU

-3

PGM MIX

-6

-9

-12

-16

-20

-30

L

R

PFL ACTIVE

AUD

AUX

EXT
MON

USB

IN

CRM+ PHONES

MIX B

SELECTION

CRM

SPEAKERS

MIN MAX

DIM SPKS

CUT SPKS

MIC FADER UP
= CUT SPKS

CRM

PHONES

MIN MAX

MIN MAX

MIN MAX

MIN MAX

MIN MAX

MIX B LEV

EX MON

PGM MIX

FADER

0

5

10

15

20

30

40
50
OO

PGM

+16
+9
+6
+3
0VU

-3

-6

-9

-12

-16

-20

-30

AUD

GUEST PHONES

PFL ENABLE
TO GUEST

TO GUEST

MONO

OUT

SELECTION

TALK

GUEST
PHONES

L

MAIN

PGM
OUT

R

&

ALLEN HEATH

465mm (18.3 inches)

ST2

TEL IN

M4

INSERT

10

GAIN GAI N

40
50

100Hz

HPF

1k

2k

LPF

3k

CLF SCE

0

5

10

15

20

30

40
50
OO

CLF OUT

TELCO 1

5

0

10

-5

20

-1O

26

120Hz

20Hz 6kHz

3k

700Hz 20k

AUDITION

AUX AUX

PRE

OO +6

=

PAN

LR

REM MUTE REM MUTE

PEAK
SIGNAL

PFL

PGM
FDR

0

5

10

15

20

30

40
50
OO

T1

TEL IN

CLF OUT

TELCO 2

5

0

10

-5

20

-1O

26

120Hz

HPF

20Hz 6kHz

3k

LPF

700Hz 20k

TALKTALK

AUDITION

CLF SCE

PGMPGM

PRE

OO +6

=

PAN

LR

PEAK
SIGNAL

PFL

PGM
FDR

0

5

10

15

20

30

40
50
OO

T2

MIC MIC

LINE L INE

M1

INSERT

M1 M2 M3 M4 T1 T2

0

10

20

30

10

GAIN

0

40

MIC

50

LINE

-6-10 63 26

100Hz

HF

12kHz

-15

+15

650

1k

500

200

2k

3k

120Hz 4k

-15MF+15

LF

80Hz

-15 + 15

PRE

AUX

OO +6

MIX B
BUSBUSBUSBUSBUSBUSBUSBUSBUSBUS

=

PAN

LR

AUD AUD AUD AUD AUD AUD AUD AUD AUD AUD

REM MUTE REM MUTE R EM MUTE REM MUTE

PEAK
SIGNAL

PFL

PGM
FDR

0

5

10

15

20

30

40
50
OO

MIC MIC

LINE LINE

M3

M2

INSE RT

INSERT

0

0

20

10

GAIN

0

MIC

LINE

-6-10 63 26

HF

12kHz

-15
650

500

200

120Hz 4k

-15MF+15

LF

80Hz

-15 +15

PRE

AUX AUX AUX AUX AUX AUX AUX AUX AUX

OO +6

MIX BMIX BMIX BMIX BMIX BMIX BMIX BMIX BMIX B

=

PAN

LR

PEAK
SIGNAL

PFL

PGM
FDR

0

10

10

20

20

30

30

40

50

100Hz

+15

1k

2k

3k

0

5

10

15

20

30

40
50
OO

30

10

10

GAIN

GAIN

0

0

40

MIC

MIC

50

LINE

LINE

-6-10 63 26

-6-10 63 26

100Hz

HF

HF

12kHz

12kHz

-15

-15

+15

+15

650

650

1k

500

500

200

200

2k
3k

120Hz 4k

120Hz 4k

-15MF+15

-15MF+15

LF

LF

80Hz

80Hz

-15 + 15

-15 +15

PRE

PRE

OO +6

OO +6

=

=

PAN

PAN

LR

LR

PEAK

PEAK

SIGNAL

SIGNAL

PFL

PFL

PGM

PGM

FDR

FDR

0

5

10

15

20

30

40
50
OO

M1 M2 M3 M4 ST1 ST2 S T3

ST4

L

L

R

R

L/M

L/M

ST3

ST1

R

R

ST4

0

0

PRE

OO +6

=

LR

ST6

0

5

5

-15

-15

+15

+15

ST4

ST6 (USB)

1/2

3/4 5/USB

ST3

ST5

0

ST5

ST3

5

5

-15

-15

+15

+15

HF

HF

12kHz

12kHz

-15 + 15

-15 +15

LF

LF

80Hz

80Hz

-15 + 15

-15 +15

PRE

OO +6

OO +6

=

=

BAL

BAL

LR

LR

PEAK

PEAK

SIGNAL

SIGNAL

PFL

PFL

PGM

PGM

FDR

FDR

0

0

5

5

10

10

15

15

20

20

30

30

40

40

50

50

OO

OO

ST2

-15

ST2

ST1

ST1

-15

HF

12kHz

-15 + 15

LF

80Hz

-15 + 15

BAL

+ START/CUE +STA RT/CUE + START/CUE + STA RT/CUE

PEAK
SIGNAL

The plastic side trims are

12.5mm each so width with

385mm (15.2 inches)

97mm [3.8"]

103mm [4.1"]

450mm [17.7"]

trims removed = 360mm.

R20mm [R0.8"]

43mm [1.7"]

Weight

XB-14

Unpacked 7.5kg (16.5lb)

Packed 11.5kg (25.3lb)

A rack mounting kit is available for XB-14. The part number is: ZED1402-RK19

Allen & Heath 13 XB-14 MK2 User Guide

BLOCK DIAGRAM

R

L

R

L

ST1,3,5&7

EXT MON IN

15

13614

7

GROUND

ST5 START PU LSE

ST5 STOP/CUE PULSE8ST6 START PU LSE

ST6 STOP/CUE PULSE

ST7 START PU LSE

ST7 STOP/CUE PULSE

192103114125

ST1 START PU LSE

ST1 STOP/CUE PULSE

ST2 START PU LSE

ST2 STOP/CUE PULSE

ST3 START PU LSE

ST3 STOP/CUE PULSE

ST4 START PU LSE

ST4 STOP/CUE PULSE

REMOTE B REMOTE A

GAIN

OPTION

Move 4 jumpers on first three

stereo channels to mix input

sources ST1&2, ST3&4 and

ST5&6(USB).

REMOTE INTERFACE

LF

RETURN

R

L

USB

ST6

ST2&4

TELCO CHANNEL (T1)

LEVEL

+

-

GAIN

A/B

STEREO CHANNEL

2 BAND EQUALISER

CLEANFEED + COMMS

CLEANFEED SOURCE

COMMS MIC INPUT

2 BAND FILTER

LPF

HPF

MIC IN

+

-

LINE IN

GAIN

+

-

100Hz

MONO CHANNEL

PP

+ 48V

GLOBAL 48V SWITCH

HPF

13

6147158

MUTE_M3

MUTE_M4

CUT CRM SPEAKERS (INPUT)

MUTE_T2

GROUND

N/C

MUTE_T1

STANDARD OPERATION

OPTIONAL OPERATION

+10V

192103114125
M1 FADER UP LOGIC

M2 FADER UP LOGIC

M3 FADER UP LOGIC

M4 FADER UP LOGIC

T1 FADER UP LOGIC

T2 FADER UP LOGIC

MUTE_M1

MUTE_M2

123456789

D SUB 3 (METERS)

+ 15V

-15V

GND

LEFT METER (POST FADE PGM L)

RIGHT METER (POST FADE PGM R)

GND

GND

GND

PULSE LOW = START

PULSE LOW = STOP

SWITCH

LOGIC

DISABLE ON

ON

MONO INPUTS

ON ON ON ON ON ON ON ON ON ON ON ON

1234

(MAKE PERMANENTLY ON)

DISABLE ON SWITCHES

(LED'S ALWAYS ON)

T1 T2 1 2 3 4

STEREO INPUTS

ON ALL 4 STEREO CHs

OPTION

PRE

MUTE CIRCUIT (JAM ON)

LEDs FOLLOW SWITCH

DISABLE STEREO

BUT

AUX

1 - 4 PREFADE

MIC CHANNELS

USB RTN

TALK SELECTION

MONO CHANNEL

PRIORITY SWITCHING (OPTION FOR ADDITIVE MIX)

AT SERVICE CENTRE

FACTORY SET TO M1

CAN BE CHANGED

TO GUEST

TALK

EXT MON

AUX

AUD

ENABLE

PFL TO GUESTS

USB RTN

EXT MON

MIX B

AUD

AUX

HEADPHONES

GUEST

SPEAKERS

CRM

CUT CRM SPKR S

FROM MIC FDRS

TALKBACK

HF

AUDITION - T1

AUX - T1

MONO PGM - T1

MUTE

METER

PEAK

SIGNAL

PFL

FADER

OPTION

PAN

MIX B

AUD

PFL ACTIVE

USB RTN

EXT MON

PRIORITY SWITCHING (OPTION FOR ADDITIVE MIX)

AUX

USB RTN

EXT MON

MIX B

MIX B

AUD

AUD

PRIORITY SWITCHING

MIX B

RETURN

USB

AUD

AUX

PFL

CUT/DIM

HEADPHONES

GUEST

HEADPHONES

CRM

R

L

SPEAKERS

CRM

DIM

PHONES

LEVEL

CRM

METERS

TALK

LOW= FADER UP

DISABLE ON

AT SERVICE CENTRE

FACTORY SET TO M1

CAN BE CHANGED

MONO CHANNEL

TALK SELECTION

LOW= FADER UP

METER

ON

SWITCH

LOGIC

MUTE

SWITCH

PEAK

SIGNAL

LOGIC

PFL

FADER

PAN

PRE

MIX B

AUX

OPTION

PRE

AUX

AUD

AUX

MONO PGM

MIX B LEVEL

AUDITION LEVEL

AUX

AUX + MONO

AUDITION

USB DEVICE

MIX B

AUD

USB STEREO I/O

R

R

L

MIX B OUT

0dBu

AUX OUT

L

0dBu

OUT

AUDITION

INSERT

LF

3 BAND EQUALISER

HM HF

ON

DISABLE ON

MUTE

METER

REMOTE MUTE

PEAK

SIGNAL

FADER

X B-14 MK2 BLOCK DIAGRAM

PFL

PAN

MIX B

AUD

MONO PGM

L INSERT

R INSERT

MAIN PGM

FADER

EXT METER

M

MAIN PGM

OUT

+4dBu

L

R

Allen & Heath 14 XB-14 MK2 User Guide

MONO INPUT CHANNEL

MIC

LIN E

M1

IN S ER T

Mic Input Socket

Standard 3-Pin XLR socket wired as Pin 1=Chassis, Pin 2=hot
(+), Pin 3=Cold (-).

Line Input Jack Socket

Standard 1/4” (6.25mm) Jack socket for balanced or unbalanced line
level signals. Wired Tip=Hot (+), Ring=cold (-), Sleeve=Chassis.
The Line input overrides the Mic input, so if you want to hear
something plugged in to the xlr socket, make sure nothing is
plugged into the Line input.

Insert Jack Socket

Standard 1/4” (6.25mm) Jack socket for unbalanced insert send and
return signals. Wired Tip=send, Ring=return, Sleeve=Chassis. Nom­inal level is 0dBu. The insert point is after the 10 0Hz filter and be­fore the EQ.

M1

GAIN

dBr

10.00

0.00

-10.00

-20.00

-30.00

MIC

LIN E

0

20

10

30

0

-6-1 0 63 26

10

40

50

100Hz

Gain Control

This adjusts the gain of the input amplifier to match the signal level
of the input. The gain is varied from –6dB (attenuation) to +63dB
for signals plugged in to the xlr socket (Mic Input) and –10dB to
+26dB for signals plugged into the Line input jack.

100Hz High Pass Filter

The Hi-pass filter is used for reducing pop noise and rum­ble from microphone signals. It is a 2-pole (12dB per oc­tave) filter with a corner frequency set at 100Hz.
The filter affects signals from both Mic XLR and Line jack
socket.

-40.00

-50.00

10.00 Hz 100.00 1000.00 10000.00 30000. 00

Allen & Heath 15 XB-14 MK2 User Guide

MONO INPUT CHANNEL

M1

GAIN

0

MIC

LIN E

HF

12kH z

-15
500

200

120H z 4k

MF

10

0

20

30

10

40

50

-6-10 63 26

100Hz

+15

650

1k

3k

2k

HF EQ

The HF (High Frequency) equaliser affects the frequency response
of the higher audible frequencies. The corner frequency of 12kHz is
around 3dB from the maximum cut or boost of the circuit. It has
plenty of gain and actually gives slightly more that the +/-15dB leg­end suggests.

dBr

20.00

15.00

10.00

5.00

0.00

-5.00

-10.00

-15.00

-20.00

10.00 Hz 100.00 1000.00 10000.00 30000.00

MF EQ

The MF (Mid Frequency) equaliser affects the middle of the audible
frequency range. The frequency graduations on the sweep control
are the centre frequencies of the EQ. The range has been carefully
chosen to cover “boomy” frequencies around 120Hz to 250Hz
which may need cutting back, or a lift at 2 to 3kHz may be required
for microphone intelligibility.

-15

+15

LF

80H z

-15 + 15

LF EQ

The LF (Low Frequency) equaliser
affects the response at the low end of
the audio range. The graph shows the
response of the LF EQ at maximum
cut and boost. The corner frequency
is 80Hz.

dBr

20.00

15.00

10.00

5.00

0.00

-5.00

-10.00

-15.00

-20.00

10.00 Hz 100.00 1000.00 10000.00 30000.00

dBr

20.00

15.00

10.00

5.00

0.00

-5.00

-10.00

-15.00

-20.00

10.00 Hz 100.00 1000.00 10000.00 30000.00

Allen & Heath 16 XB-14 MK2 User Guide

MONO INPUT CHANNEL

Aux

This control sends a signal to an auxiliary bus. The signal is sourced pre-fade
or post-fade depending on the PRE switch position. The pre-fade source
selection will be affected by the channel ON/OFF switch if active. The send
control varies the signal level to the bus from off (fully attenuated) to +6dB,
with unity gain at the arrow.

MIX B

The MIX B switch routes the channel signal to a stereo bus which is inde­pendent of the main PGM (program) bus. The signal is post-fade and follows
the PAN control. The MIX B bus can be used for creating mixes for record­ing or clean-feed sources for external equipment.

PAN

The pan control adjusts how the signal from the mono input channel is
shared between the left and right sides of the PGM, Audition and MIX B bus.
Set to the mid position, equal amounts of signal are fed to left and right,
with pan set to L, none is sent to the Right bus.

AUX

PAN

REM MUTE

PRE

OO +6

MIX B
BUS

=

LR

AUD

PEAK
SIGNAL

PFL

PGM
FDR

AUDITION

Pressing the audition button illuminates the red LED and switches the signal
from the program bus to the audition bus. The signal is post fade and fol­lows the PAN control. The AUD switch is after the MIX B switch in the
signal chain and so has no effect on the MIX B selection.

ON Switch

0

5

10

15

20

This mechanically latching switch operates the channel mute circuitry, turn­ing the signal to the PGM, Audition, MIX B and Aux buses on or off.
The switch is illuminated green when pressed.
There is an option to disable the switch (make permanently ON) using the
option switches on the rear-panel. If this is activated, then the switch will be
illuminated green regardless of whether it is pressed or not.
There is also a remote mute option wired to a D type connector on the
rear panel. When this is wired and operated the REM MUTE red LED illumi­nates and the mute circuit is activated regardless of whether the ON switch
is pressed.

SIGNAL & PEAK LEDs

The Signal LED illuminates when the pre-fader signal level is above –15dB.
The Peak LED illuminates and stays on for around 0.5 seconds when a peak

30

level is detected (pre-fader signal) within 5dB of clipping.

PFL Switch

40
50

OO

The PFL (Pre-Fade Listen) switch sends the channel signal to the PFL bus
and subsequently to the headphones/CRM speakers and the main L R me­ters. Used for checking the audio signal before raising the fader or un­muting the channel.

Fader

The 100mm fader controls the level of the channel signal to the left & right

M1

Allen & Heath 17 XB-14 MK2 User Guide

PGM bus, Audition bus, MIX B bus and post fade Aux.
The Mono channel faders have Fader Start switching logic available to either
interface to external equipment or activate the muting circuit for the con­trol room speaker outputs.

TELCO CHANNELS

TE L IN

CLF O UT

TE LCO 1

TEL IN

The Telephone Communication channel input XLR socket. Wired
as Pin 1=Chassis, Pin 2=hot (+), Pin 3=Cold (-).

CLF OUT

Standard XLR output connector for the Clean-Feed output from
the Telephone Communication channel.
Wired Pin 1=Chassis, Pin 2=hot (+), Pin 3=Cold (impedance bal­anced ground).

TELCO Input Gain

The Telephone Communication channel input gain con trol. Varies
the gain applied to the TELCO input channel from –10dB to +26dB.

T1

GAIN

HPF

LP F

0

-5

-1O

20H z 6kH z

120H z

3k

5

10

20

26

TELCO Channel Filters

The TELCO Channel has a high pass and low pass total cut filter which
is designed to allow the user to reduce the frequency range of the
channel when used with a telephone caller.

The high pass filter can be varied from 20Hz (full range) to 6kHz. The
low pass filter from 20kHz (full range) to 700Hz.

The default position (full range frequency response) is shown.

dBr

5.00

0.00

-5.00

-10.00

-15.00

-20.00

-25.00

700Hz 20k

Allen & Heath 18 XB-14 MK2 User Guide

-30.00

20.00 Hz 100.00 1000.00 10000.00 30000.00

CLF SCE

TALK

AUDITION

AUX

PGM

PRE

TELCO CHANNELS

TALK

The TALK switch enables the presenter or operator to communicate with
the telephone caller with the presenters channel fader down so the pre­senters voice does not go to the program mix.
The source for the TALK signal is one of the mono channels, pre-selected
by links set within the XB-14, the factory default is mono channel 1. The
signal source is pre-fade and pre-mute on the selected mono channel.

CLF SCE

The Clean-Feed Source switch selects the signal source for the TELCO
cleanfeed output. With both buttons in the up position the signal will be the
entire program (PGM) mix (pre main PGM fader) but without the signal
from the input on that TELCO channel, so the caller does not hear any dis­tracting echo of their voice.
If the AUX or AUDITION switch is pressed, the TELCO clean feed signal is
sourced from the selected bus, but minus the signal sent from that TELCO
channel.

This is a really useful feature that can enable the operator to send a mix of
signals from different channels to the telephone caller, the sources may be
on or off air because the sources for the AUX bus can be pre or post fader
or the Audition bus can be used.
In addition, The telephone conversation could be recorded off air using the
audition or aux buses, and replayed at a later time.

AUX

PAN

OO +6

MIX B
BUS

=

LR

AUX

This control sends a signal to an auxiliary bus. The signal is sourced pre-fade
or post-fade depending on the PRE switch position. The pre-fade source
selection will be affected by the channel ON/OFF switch if active. The send
control varies the signal level to the bus from off (fully attenuated) to +6dB,
with unity gain at the arrow.

MIX B

The MIX B switch routes the channel signal to a stereo bus which is inde­pendent of the main PGM (program) and audition buses. The signal is post­fade and follows the PAN control. The MIX B bus can be used for creating
mixes for recording or clean-feed sources for external equipment.

PAN

The pan control adjusts how the signal from the TELCO input channel is
shared between the left and right sides of the PGM, audition and MIX B bus­es. Set to the mid position, equal amounts of signal are fed to left and right,
with pan set to L, none is sent to the Right bus.

Allen & Heath 19 XB-14 MK2 User Guide

TELCO CHANNELS

AUDITION Switch

AUD

REM MUTE

PEAK
SIGNAL

PFL

PGM
FDR

0

Pressing the audition button illuminates the red LED and switches the sig­nal from the program bus to the audition bus. The signal is post fade and
follows the PAN control. The AUD switch is after the MIX B switch in the
signal chain and so has no effect on the MIX B selection.

ON Switch

This mechanically latching switch operates the channel mute circuitry, turn­ing the signal to the PGM, Audition, MIX B and Aux buses on or off.
The switch is illuminated green when pressed.
There is an option to disable the switch (make permanently ON) using the
option switches on the rear-panel. If this is activated, then the switch will
be illuminated green regardless of whether it is pressed or not.
There is also a remote mute option wired to a D type connector on the
rear panel. When this is wired and operated the REM MUTE red LED illu­minates and the mute circuit is activated regardless of whether the ON
switch is pressed.

5

10

15

20

30

40
50

OO

SIGNAL & PEAK LEDs

The Signal LED illuminates when the pre-fader signal level is above –15dB.
The Peak LED illuminates and stays on for around 0.5 seconds when a peak
level is detected (pre-fader signal) within 5dB of clipping.

PFL Switch

The PFL (Pre-Fade Listen) switch sends the channel signal to the PFL bus
and subsequently to the headphones/CRM speakers and the main L R me­ters. Used for checking the audio signal before raising the fader or switching
on the channel or raising the fader.

Fader

The 100mm fader controls the level of the TELCO channel signal to the left
& right PGM bus, MIX B bus and post fade Aux.
The TELCO channel faders have fader start switching logic signals available
on the rear-panel remote interface connectors for control of external
equipment.

T1

Allen & Heath 20 XB-14 MK2 User Guide

STEREO INPUT CHANNELS ST1 & ST2

ST2

-15

ST2

ST1

0

L

R

L/M

R

5

FOR CLARITY ONLY ST1 CHANNEL IS DESCRIBED HERE

ST2 Inputs

Standard RCA phono sockets for ST2 L & R inputs.
Unbalanced. Nominal input level = 0dBu.

ST1 Inputs

Standard 1/4” jack sockets for input signals to ST1 L & R inputs.
Wired Tip=Hot(+), Ring=cold (-), Sleeve=Chassis.
Fully balanced. Nominal input level = 0dBu.

Stereo source selector switch

Selects either ST1 or ST2 stereo inputs to the stereo channel ST1.
Allows the user to select between multiple stereo sources connected to
the XB-14.
A green LED will illuminate to show which input is selected.

Stereo input level controls

For adjustment of the stereo input levels from fully attenuated to +15dB
of gain.

ST1

-15

HF

12kH z

-15 + 15

LF

80Hz

-15 + 15

AUX

ST2

ST1

+15

Stereo channel EQ

The stereo channel EQ is 2 band with corner frequencies of 12kHz for

1/2

0

5

+15

the HF and 80Hz for the LF.

dBr

20.00

15.00

10.00

5.00

0.00

-5.00

-10.00

-15.00

-20.00

10.00 Hz 100.00 1000.00 10000.00 30000.00

AUX

This control sends a signal to an auxiliary bus. The signal is sourced pre-

PRE

fade or post-fade depending on the PRE switch position and is a com­bined sum of the left and right stereo signals. The pre-fade source selec­tion will be affected by the channel ON/OFF switch if active. The send
control varies the signal level to the bus from off (fully attenuated) to
+6dB, with unity gain at the arrow.

OO +6

MIX B

MIX B
BUS

Allen & Heath 21 XB-14 MK2 User Guide

The MIX B switch routes the channel signal to a stereo bus which is inde­pendent of the main PGM (program) and audition buses. The signal is post­fade and follows the PAN control.

STEREO INPUT CHANNELS ST1 & ST2

BAL

=

LR

AUD

+START/CUE

PEAK
SIGNAL

PFL

PGM
FDR

0

5

10

15

20

30

40
50

OO

FOR CLARITY ONLY ST1 CHANNEL IS DESCRIBED HERE

BAL

The balance control adjusts the relative levels of the left & right signals in the
stereo input channel as they are sent to the PGM, Audition and MIX B buses.
Set to the mid position, the signals are balanced equally. With the balance con­trol set fully anticlockwise the right channel will be fully attenuated and the left
channel will increase by approximately 3.5dB.

AUDITION Switch

Pressing the audition button illuminates the red LED and switches the signal
from the program bus to the audition bus. The signal is post fade and follows
the PAN control. The AUD switch is after the MIX B switch in the signal chain
and so has no effect on the MIX B selection.

ON (+START/CUE) switch

The stereo channel ON switch operates the stereo channel mute circuitry,
turning the signals to the PGM, MIX B, Audition and Aux buses on or off.
The switch is illuminated green when pressed.
The ON switch also activates the START/CUE logic signals (for the corre­sponding selected input) wired to the remote interface connector on the rear
panel.

There is an option to disable the mute circuit on all the stereo channels (make
the channels permanently ON) using the option switches on the rear panel.
This can be done for all 4 stereo channels togeth er, retaining the illumination
switching (if the ON switch is being used for Start/Cue).
It can also be done on an individual channel basis by using the STEREO INPUTS
1,2,3&4 slide switches in which case the illumination of the switch will be

STEREO
ON Switch
Optional
Modes

Standard
Operation

Mute
Disabled
(Always ON)
LEDs FOLLOW
SWITCH
(All stereos)

Mute
Disabled
(Always ON
All Stereos)
LEDs always
illuminated
(On ST1 only)

jammed permanently ON.

MONO INPUTS

1234 T1T212 34

ON ONON ON ON ON ON ON ON ON ON ON

MONO INPUTS

1234 T1T212 34

ON ONON ON ON ON ON ON ON ON ON ON

MONO INPUTS

1234 T1T212 34

ON ONON ON ON ON ON ON ON ON ON ON

STEREO INPUTS

STEREO INPUTS

STEREO INPUTS

ON Switch Not Pressed ON Switch Pressed

Channel Muted
CUE Deck

Channel ON

CUE Deck START Deck

Channel ON Channel ON

CUE Deck

Fader

The 100mm fader controls the level of the stereo channel L & R signals to the
PGM, MIX B, Audition and post fade Aux buses.
There is no fader start logic feature on the stereo channel faders.

Channel ON
START Deck

Channel ON

START Deck

SIGNAL & PEAK LEDs

The Signal LED illuminates when the pre-fader L or R signal level is above –

ST1

15dB.
The Peak LED illuminates and stays on for around 0.5 seconds when a peak
level is detected (pre-fader signal) within 5dB of clipping.

PFL Switch

Sends the summed L & R stereo channel signals to the PFL bus.

Allen & Heath 22 XB-14 MK2 User Guide

STEREO INPUT CHANNELS ST3 & 4

ST6

-15

MIX B OUT

ST5

0

+15

ST6 (USB)

5/US B

L

R

L/M

R

5

SIMILAR TO THE ST1 & 2 CHANNELS—
THE DIFFERENCES ARE DETAILED HERE.

MIX B OUT

Standard RCA phono sockets for the MIX B bus output. The output
level can be controlled by the MIX B Level control.
Nominal level = 0dBu, unbalanced.

USB RTN (ST6) level

The source for the ST6 input is from the USB audio device, in other
words from an external computer. The level control varies the gain ap­plied to the USB audio device input signal from off (fully attenuated) to
+15dB.

CRM SPEAKE R S

RETURN

ST5

L

R

L/M

ST7

R

USB

SEND

AUX + MON O

CRM SPEAKERS outputs

Standard RCA phono sockets for connecting to either powered speakers
or a stereo amplifier for the control room speakers. The output level can
be controlled by the CRM Speakers Level control.
Nominal level = 0dBu, unbalanced.

USB audio send & return

The USB connection uses a USB1.1 compliant stereo USB audio CODEC
which is also fully compliant with USB 2.
The connector is a standard USB “B Type” connector.
When connected to a computer (Windows or Mac) you will be able to
transfer stereo audio to and from the XB-14.
The signal source for the send is selected using the switches below the
USB connector.

If all switches are un-pressed, the post-fader main program mix will be
sent to the USB output. The priority switch matrix also gives the choice
of post level MIX B, post level audition bus and AUX (left hand channel)
and mono program feed (right hand channel).

The USB audio input can be selected to feed the stereo channel 4 (ST4)
by selecting the stereo input 6 (ST6) to that channel.

AUDITION

USB SOURCE SELECT

MIX B

PGM MIX

Allen & Heath 23 XB-14 MK2 User Guide

MASTER SECTION

Audition Out

Standard RCA phono sockets for the Audition bus output. The out­put level can be controlled by the AUD Level control.
Nominal level = 0dBu, unbalanced.

External Monitor Input

Standard RCA phono sockets for a stereo signal which can be routed
to either the engineers’ CRM monitor headphones & speakers, or the
guest headphones. It can be used for monitoring the program trans­mission or switching any external stereo source to the engineers or
guests monitors.
The input level can be controlled with the EX MON level control.
Nominal level = 0dBu, unbalanced.

Main PGM Inserts

Standard 1/4” (6.25mm) Jack socket for unbalanced insert send and
return signals.
Wired Tip=send, Ring=return, Sleeve=Chassis. No minal level is 0dBu.

AUD O U T

EXT MON IN

INS ERT L

L

R

INS ERT R

L

AUX

L

MAIN

PGM
OUT

R

The insert point is pre the main PGM fader.

Main PGM Outputs

Standard XLR output connector for the main program mix left &
right outputs.
Wired Pin 1=Chassis, Pin 2=hot (+), Pin 3=Cold (-).
Electronically balanced, nominal level = +4d Bu (=0VU).

GUEST PHONES 1

R

GUEST PHONES 2 CRM PHONES

MONO

OUT

AUX Output

Standard 1/4” (6.25mm) Jack socket for aux output.
Wired Tip=Hot (+), Ring=cold (-), Sleeve=Chassis. Impedance bal­anced. Nominal level = 0dBu.

Mono Output

Standard RCA phono socket for the Mono PGM bus output.
The mono program bus is Nominal level = 0dBu, unbalanced.
The PGM mono output is a mono version of the main PGM stereo
out but is independent of the main fader.

Headphone Output Sockets

Standard 1/4” (6.25mm) Jack sockets for the engineer/self operator
and two guests.
Wired Tip=Left (+), Ring=Right (-), Sleeve= Ground.

!

Warning ! To avoid damage to your
hearing do not operate the headphones
or sound system at excessively high
volume. Continued exposure to high
volume sound can cause frequency
selective or wide range hearing loss.

Allen & Heath 24 XB-14 MK2 User Guide

MASTER SECTION

48v Phantom Power switch

Press this in to switch 48v Phantom Power to the 4 Mic input xlr
connectors, if any of the microphones attached require power.
Dynamic microphones won’t mind being connected to a phantom
powered input, but care is needed to ensure that 48v is not switched
on if an xlr is used to input a signal from an electronic circuit (ie. An­other mixer or keyboard).

When switching 48v on or off, or plugging in connectors to
channels with 48v present, it is important (and normal pro­cedure) to mute the channels. This will avoid loud clicks and
bangs potentially getting through to the amps & speakers
with the possible effect of damaging the speakers, or the au­dience’s hearing!

48V

DIM SPKS

ON

CRM+ PHONES

SELECTION

CRM

SPEAKE RS

POWE R

+16

+9
+6
+3

0VU

-3

-6

-9

-12

-16

-20

-30

L

PFL ACTIVE

MIN MAX

AUD

AUX

EXT

MON

USB

IN

MIX B

+16

+9
+6
+3

0VU

-3

-6

-9

-12

-16

-20

-30

R

&

Main Left & Right meters

12 segment LED meters, peak type response, the “0” position reflects
nominal level at the outputs (+4dBu from the main PGM outputs).
The meters display the signals from the CRM + Phones selector
switches below, or the PFL (pre-fade listen) signal from any selected
channels, which overrides.

PFL Active LED

Illuminates red when any one or more PFL (pre-fade listen) switch is
pressed. Indicates that the meters are displaying the PFL signal rather
than the signal from the selected source.

GUEST PHONES

SELECTION

PFL ENABLE

TO G U EST

TALK

TO GU EST

ALLEN HEATH

CRM + PHONES Source Selector switches

These 5 switches select the signal source for the control room speak­ers, headphones monitor and the meters. They work on a priority
basis. If they are all up then the post-fade main PGM signals will feed
the monitor circuit, if any of the switches are pressed then the PGM
signal will be replaced. If more than one switch is pressed the switch
nearest the meters will take priority.
The PFL signal will override the selection to the meters and CRM if
activated.

GUEST PHONES Source Selector switches

Similar to the CRM + PHONES selection switches, these select the
source for the guest headphones output. The choices are the same as
for the CRM outputs, but a different source can be selected for the
guests to that selected for the operator.
The PFL signal will not be fed to the guest phones outputs unless the
PFL ENABLE TO GUEST switch is pressed. This is an under-panel
switch so it cannot be operated accidentally.

TALK TO GUEST switch

Pressing this switch allows the microphone channel that has been
selected as the comms channel, to speak to the guest headphone
feed. If the guest is listening to the program mix, for example, this
will reduce in volume to a background level when the talk switch
is pressed.

Allen & Heath 25 XB-14 MK2 User Guide

MASTER SECTION

CRM Speakers level

Adjusts the level of the signal to the control room speaker outputs
from off (fully attenuated) to unity gain.

DIM & Cut CRM Speakers

The Dim switch reduces the level of the control room speakers by

CRM

SPEAKERS

DIM SPKS

CUT SPKS

MIC FADER UP

= CUT SPKS

MIN MAX

EX MON

CRM

PHONES

MIN MAX

MIN MAX

MIN MAX

MIX B LEV

PFL ENABLE

TO GUE ST

MIN MAX

MIN MAX

AUD

TALK

TO GUEST

GUEST

PHONES

20dB.
The Cut CRM Speakers LED illuminates red when the control room
speakers mute circuit is activated, either by external switching using
the remote interface or by raising any one of the mono channel fad­ers (if the MIC FADER UP switch has been pressed).

MIC FADER UP = CUT Speakers

An under-panel switch to enable the fader start logic switching to cut
the control room speaker outputs. This is useful when the CRM
speakers are in close proximity to the microphones plugged into the
mono channels and acoustic feedback may occur from the speakers
to the microphones.
Press the switch to enable the automatic muting.

PGM

PGM MIX

FADER

0

5

10

15

20

30

40
50
OO

Control Room Phones level

Adjusts the level of the operators’ control room headphones from off
(fully attenuated) to maximum. The headphone amplifier has a gain of
12dB.

Guest Phones level

Adjusts the level of the guests’ headphones from off (fully attenuated)
to maximum.
Each headphone output socket has a dedicated amplifier with a gain
of 12dB.

EX MON level

This is the master level control for the external monitor stereo input.
The range of adjustment is from off (fully attenuated) to unity gain.

MIX B level

This is the master level control for the MIX B stereo bus output.
The range of adjustment is from off (fully attenuated) to unity gain.

AUD level

This is the master level control for the audition stereo bus output.
The range of adjustment is from off (fully attenuated) to unity gain.

Program Mix Fader

The main program mix level control. Affects the stereo PGM output,
but not the mono PGM output.
0dB, or unity gain is at the top of the fader.

Allen & Heath 26 XB-14 MK2 User Guide

REMOTE INTERFACE CONNECTORS

15 Way D socket connector REMOTE A

PIN FUNCTION

1 M1 FADER UP LOGIC (OPEN COLLECTOR OUTPUT)
2 M3 FADER UP LOGIC (OPEN COLLECTOR OUTPUT)
3 T1 FADER UP LOGIC (OPEN COLLECTOR OUTPUT)
4 M1 EXTERNAL MUTE (INPUT, ACTIVE LOW)
5 M3 EXTERNAL MUTE (INPUT, ACTIVE LOW)
6 T1 EXTERNAL MUTE (INPUT, ACTIVE LOW)
7 CUT CRM SPEAKERS (INPUT, ACTIVE LOW)
8 GROUND

9 M2 FADER UP LOGIC (OPEN COLLECTOR OUTPUT)
10 M4 FADER UP LOGIC (OPEN COLLECTOR OUTPUT)
11 T2 FADER UP LOGIC (OPEN COLLECTOR OUTPUT)
12 M2 EXTERNAL MUTE (INPUT, ACTIVE LOW)
13 M4 EXTERNAL MUTE (INPUT, ACTIVE LOW)
14 T2 EXTERNAL MUTE (INPUT, ACTIVE LOW)
15 N/C

15 Way D plug connector REMOTE B

PIN FUNCTION

1 ST1 START PULSE (OPEN COLLECTOR OUTPUT)

2 ST2 START PULSE (OPEN COLLECTOR OUTPUT)

3 ST3 START PULSE (OPEN COLLECTOR OUTPUT)

4 ST4 START PULSE (OPEN COLLECTOR OUTPUT)

5 ST5 START PULSE (OPEN COLLECTOR OUTPUT)

6 ST6 START PULSE (OPEN COLLECTOR OUTPUT)

7 ST7 START PULSE (OPEN COLLECTOR OUTPUT)

8 GROUND

9 ST1 STOP/CUE PULSE (OPEN COLLECTOR OUTPUT)
10 ST2 STOP/CUE PULSE (OPEN COLLECTOR OUTPUT)
11 ST3 STOP/CUE PULSE (OPEN COLLECTOR OUTPUT)
12 ST4 STOP/CUE PULSE (OPEN COLLECTOR OUTPUT)
13 ST5 STOP/CUE PULSE (OPEN COLLECTOR OUTPUT)
14 ST6 STOP/CUE PULSE (OPEN COLLECTOR OUTPUT)
15 ST7 STOP/CUE PULSE (OPEN COLLECTOR OUTPUT)

Start/Cue logic

The Start/Cue logic from the Stereo channel ON switches is designed to interface to a common standard employed
by Denon and Pioneer equipment. The logic signals are usually wired to a 2 pole 3.5mm jack plug where a low pulse
on the tip starts the deck and a low pulse on the sleeve stops or cues the deck. There needs to be some form of
ground connection between the equipment for this to work—normally effected by the audio connector leads.
Notice that there are Start/Cue outputs for 7 machines even though there are only 4 Stereo channel ON switches.
That’s because there are dual inputs on 3 of the stereo channels making a total of 7 sources and the XB-14 only sends
a Start/Cue signal to the deck selected as a source to the channel whose switch is pressed. It’s clever like that!

Allen & Heath 27 XB-14 MK2 User Guide

REMOTE INTERFACE CONNECTORS

9 Way D socket connector EXTERNAL METER

PIN FUNCTION

1 +15V POWER

2 -15V POWER

3 GROUND

4 LEFT METER

5 RIGHT METER

6 GROUND

7 GROUND

8 GROUND

9 +10V POWER

External Meter socket

This can be used to feed the main Program PGM L & R signals to external metering equipment. T hese are lin e level
analogue signals, the level at 0VU will be 0dBu.
+/- 15V power is also available to power meter circuits, current draw should be kept under 100mA or so.

ON SWITCH OPTIONS

DISABLE STEREO

MUTE CIRCUIT (JAM ON)

BUT

LEDs FO LLOW SWITCH
ON ALL 4 STEREO CHs

DISABLE ON SWITCHES

(MAKE PERM ANENTLY ON)

(LED'S ALWAYS ON)

STANDARD OPERATION
OPTIONAL OPERATION

MONO INPUTS

1234

ON ON ON ON ON ON ON ON ON ON ON ON

STEREO INPUTS

T1 T2 1 2 3 4

Configuration Switches

The tiny slide switches accessible on the rear panel are for configuring the XB-14’s channel ON switches. In the up position,
the channel ON switch will act as a normal ON/OFF switch affecting the channel signal accordingly. If the slide switch is moved
down to the “ON” position, then the corresponding channel’s ON switch will be disabled (made so th at it is jammed ON).
The green LEDs in the switch will then permanently illuminate. UNLESS….
Unless you are using the Stereo channel ON switches for transport Start/Cue and would like the channel mute circuit disabled
but the switch illumination still to follow the switch position. In this case use the last switch in the row to disable the mute
circuit on all 4 stereo channels, but make the illuminatio n follow the switch position.
If you want, you can disable the Stereo channel mute circuit on an individual chan nel basis using the Stereo Inputs 1,2,3 & 4
slide switches individually. This will make the channel permanently on and the switch illumination also permanently on.

This may seem like a fussy complication, but could be useful if you want to revert to basic operation, where only the faders
control the signal going out on air, disabling the ON switches so the operator cannot turn off the channel accidentally, but still
want the switch illumination on certain stereo channels to follow t he Start/Cue on the CD player or deck.

ALSO SEE P22 FOR A DIAGRAM TO EXPLAIN THESE SETTINGS.

Allen & Heath 28 XB-14 MK2 User Guide

REMOTE INTERFACE CONNECTORS

REMOTE A Connector wiring

The REMOTE A connector is used for the “Fader Up” logic signals from the Mono and Telco channel faders. It is also
used for remote muting of channels and control room speakers. An example of how these remote signals can be used
is below:

REMOTE A Connector Example: Remote mute wiring and Fader Up interface

Remote mute switch for Mono Ch2

Pin 12 = mute Mono Ch2

REMOTE A

+12V +12V

Relay or circuit

9

10 11 12

1

3

2

Pin 1 = CH 1 Fader = UP

Input resistor = 10 Ohms for over-current protection.
Ensure input current is less than 100mA

4

14

13

56

15

8

7

Ground

ON AIR

100mA max

REMOTE B Connector Example: CD Deck start/cue from stereo channel ON switch

REMOTE B

9

1415

13

8

5

7

6

101112

4

1

3

2

Cue pulse wire to sleeve

Start pulse wire to tip

3.5mm Jack Plug

To CD player or deck

Optional

Additional Ground wire may be required

Allen & Heath 29 XB-14 MK2 User Guide

3

ST4

L

R

L/M

ST3

R

T4

0

-15

+15

ST4

3/4 5/USB

ST3

0

T

-15

+15

HF

kHz

-15 +15

LF

0Hz

-15 +15

PRE PRE PRE

UX AUX AUX

USB CONNECTION

MIX B OUT

CRM SPEAK ERS

L

R

L/M

ST5

R

ST6

0

5

5

-15

RETURN

+15

ST6 (USB)

USB SOURCE SELECT

ST5

0

ST5

-15

HF

LF

80Hz

-15 +15

-15 +15

ST7

5

-15

+15

HF

12kHz

LF

80Hz

5

12kHz

ST7

0

-15 +15

-15 +15

L

R

L/M

R

USB

SEND

AUX+ MONO

AUDITION

MIX B

5

+15

AUD OUT

EXT MON IN

GUEST PHONES 1

48V

PGM MIX

INSERT L

L

R

INSERT R

L

AUX

R

GUEST P HONES 2 CRM PH ONES

POWER

ON

PFL ACTIVE

L

MAIN
PGM
OUT

R

MONO

OUT

+16

+16

+9

+9

+6

+6

+3

+3

0VU

0VU

-3

-3

-6

-6

-9

-9

-12

-12

-16

-16

-20

-20

-30

-30

L

R

AUD

AUX

EXT
MON

USB

IN

&

ALLEN HEATH

USB Audio Interface

The XB-14 is equipped with a stereo bi-directional USB 1.1 compliant audio CODEC. It is fully compliant with USB2
ports and uses standard Windows and MAC Core Audio Drivers. In other words, plug it in and your computer will find
it and be able to transfer audio to and from the USB device.

You will need some form of audio software running on your computer for playback/recording or a voice over internet
phone, but on a basic level, you can use your computers media player to play straight to the XB-14 device.

Just a couple of points to look out for:

Windows XP/Vista:

When you plug in your XB-14 USB interface to your computer, if the volume level is low or inaudible, check the device
volume in control panel/Sounds and Audio Devices/Volume. Set the volume to High.

Windows 7:

At present, Windows 7 treats the USB audio device as a microphone source instead if a line input, so set the device
volume level much lower, we found setting to 3 is ideal.

Allen & Heath 30 XB-14 MK2 User Guide

APPLICATION DIAGRAM: SELF OPERATION

Ensure FADER UP = CUT SPKS switch is enabled to avoid feedback from CRMs

Notes:

The Telephone module could be substituted with a Skype system.

Guests

Operator

Hybrid Module

Telephone

GAIN

M1 M2 M3 M4 T1 T2

AUX

12kHz

80Hz

OO +6

MIX B

BUSBUSBUSBUSBUSBUSBUSBUSBUSBUS

AUXAUXAUXAUXAUXAUXAUXAUXAUX

OO +6

MIX B MIX B MIX B MIX B MIX B MIX B MIX B MIX B MIX B

OO +6

OO +6

OO +6

OO +6

OO +6

OO +6

OO +6

OO +6

CRM+PHONES

SPEAKERS

SELECTION

CRM

MIX B

IN

PFL ENABLE

TO GUEST

GUEST PHONES

SELECTION

MF

LF

120Hz 4k

-15

-15 +15

PRE

+15

80Hz

MF

LF

120Hz4k

-15

-15 +15

PRE

+15

80Hz

MF

LF

120Hz 4k

-15

-15 +15

PRE

+15

80Hz

MF

LF

120Hz 4k

-15

-15 +15

PRE

+15

CLF SCE

700Hz 20k

AUDITION

AUX AUX

PRE

CLF SCE

700Hz 20k

TALKTALK

PGMPGM

AUDITION

PRE

12kHz

80Hz

HF

LF

-15 +15

-15 +15

PRE

+15

12kHz

80Hz

HF

LF

-15 +15

-15 +15

PRE

+15

12kHz

80Hz

HF

LF

-15 +15

-15 +15

PRE

+15

12kHz

80Hz

HF

LF

-15 +15

-15 +15

PRE

+15

PFL ACTIVE

L

MON

AUX

AUD

USB

EXT

R

&

ALLEN HEATH

LINE

HF

MIC

200

-15

0

500 1k

10

-6-10 6326
0
20

650

30

+15

100Hz

INSERTM1LINE LINE

MIC MIC

10

3k

50

40

2k

12kHz

GAIN

LINE

HF

MIC

200

-15

0

500 1k

-6-10 6326

10
0
20

650

30

+15

100Hz

INSERT

M2

10

3k

50

40

2k

GAIN

12kHz

LINE

HF

MIC

200

-15

0

500 1k

-6-10 6326

10
0
20

650

30

+15

100Hz

INSERT

LINE LINE

MIC M IC

M3

10

3k

50

40

2k

GAIN

12kHz

LINE

HF

MIC

200

-15

0

500 1k

10

-6-10 6326
0
20

650

30

+15

100Hz

INSERT

M4

10

3k

50

40

2k

HPF

GAIN GAIN

LPF

-5

20Hz 6kHz

-1O

CLF OUT

TELCO 1

TEL IN

0

120Hz

3k

5

26

10

20

HPF

LPF

-5

20Hz6kHz

-1O

CLF OUT

TELCO 2

TEL IN

0

120Hz

3k

5

26

10

20

ST2

ST1

-15

-15

ST1

ST2

0

0

ST1

ST2

+15

1/2

L

R

L/M

R

5

5

ST4

ST3

-15

-15

ST3

ST4

0

0

ST3

ST4

+15

3/4 5/USB

L

R

L/M

R

5

5

ST6

ST5

-15

-15

ST5

ST6 (USB)

MIX B OUT

0

0

ST5

+15

L

R

L/M

R

5

5

RETURN

ST7

-15

USB SOURCE SELECT

CRM SPEAKERS

0

ST7

AUDITION

AUX+MONO

MIX B

L

R

L/M

R

5

USB

SEND

PGM MIX

GUEST PHONES 1 GUEST PHONES 2 CRM PHONES

EXT MON IN

AUD OUT

48V

ON

R

R

L

L

POWER

INSERT L

INSERT R

AUX

+16

-20

-30

-16

-12

+3+6+9

-6

-9

-3
0VU

+16

+3+6+9

-20

-30

-16

-12

-6

-9

-3
0VU

MONO

OUT

MAIN

PGM

OUT

L

R

Sound sources

Music sources

Telephone caller

PAN

SIGNAL

PEAK

REM MUTE REM MUTE REM MUTE REM MUTE

LR

=

AUD AUD AUD AUD AUD AUD AUD AUD AUD AUD

PFL

PGM

M1 M2 M3 M4 ST1 ST2 ST3

T1

T2

ST4

FDR

OO

051015203040

50

OO

50

OO

OO

50

OO

OO

50

PGM

OO

PAN

SIGNAL

PEAK

LR

=

PFL

PGM

FDR

05101520304050OO

PAN

SIGNAL

PEAK

LR

=

PFL

PGM

FDR

05101520304050OO

PAN

SIGNAL

PEAK

LR

=

PFL

PGM

FDR

05101520304050OO

PAN

SIGNAL

PEAK

REM MUTE REM MUTE

LR

=

PFL

PGM

FDR

051015203040

PAN

SIGNAL

PEAK

LR

=

PFL

PGM

FDR

5101520304050

0

+START/CUE +START/CUE +START/CUE +START/CUE

BAL

SIGNAL

PEAK

LR

=

PFL

PGM

FDR

051015203040

BAL

SIGNAL

PEAK

LR

=

PFL

PGM

FDR

5101520304050

0

BAL

SIGNAL

PEAK

LR

=

PFL

PGM

FDR

05101520304050OO

BAL

SIGNAL

PEAK

LR

=

PFL

PGM

FDR

051015203040

MIN MAX

EX MON

MIC FADER UP

=CUT SPKS

CUT SPKS

DIM SPKS

PHONES

CRM

MIN MAX

MIN MAX

MIN MAX

MIX B LEV

PGM MIX

FADER

5101520304050

0

MIN MAX

MIN MAX

AUD

TO GUEST

TALK

PHONES

GUEST

System

PGM inserts to limiter

Headphone signals

Program mix for transmission

Single room

Self Operation

USB connection to computer

Microphone signals to mono inputs

Line level to/from telephone module

Line level stereo signals

Telephone line in (or exchange)

KEY

Monitor Speakers

Control Room

Compressor/Limiter

Amp

Limit

Jingle

CD

CD

TX 1

Broadcast

Method

Transmission

OR

Allen & Heath 31 XB-14 MK2 User Guide

APPLICATION DIAGRAM: STUDIO+CONTROL ROOM

Telephone caller Telephone caller

Studio

Presenter

Guest

Telephone
Hybrid Module

Operator/Producer

Telephone call handling

Control Room
Monitor Speakers

Amp

MIX B OUT

CRM SPEAKERS

ST2

ST4

TEL IN

TEL IN

MIC MIC

MIC MIC

LINE LINE

LINE LINE

M3

M1

INSERT

INSERTM2INSERT

M1 M2 M3 M4 T1 T2

0

0

0

10

10

30

10

10

GAIN

GAIN

GAIN

0

0

0

40

40

40

MIC

MIC

MIC

50

LINE

LINE

LINE

-10 26

-10 63

-10 63

100Hz

100Hz

100Hz

HF

HF

HF

12kHz

12kHz

12kHz

-15

-15

-15

+15

+15

+15

650

650

650

500

500

500

200

200

200

120Hz

120Hz

120Hz

-15MF+15

-15MF+15

-15MF+15

LF

LF

LF

80Hz

80Hz

80Hz

-15 +15

-15+15

-15 +15

PRE

PRE+6PRE+6PRE+6PRE+6PRE+6PRE+6PRE+6PRE+6PRE

AUX AUX AUX AUX AUX AUX AUX AUX AUX

AUX

+6

+6

MIX B

MIX B MIX B MIX B MIX B MIX B MIX B MIX B MIX B MIX B

BUS BUS BUS BUS BUS BUS BUS BUS BUS BUS

=

=

=

PAN

PAN

PAN

LR

LR

LR

AUD AUDAUDAUDAUDAUDAUDAUDAUDAUD

REM MUTE REM MUTE REM MUTE RE M MUTE

PEAK

PEAK

PEAK

SIGNAL

SIGNAL

SIGNAL

PFL

PFL

PFL

PGM

PGM

PGM

FDR

FDR

FDR

0

0

0

5

5

5

10

10

10

15

15

15

20

20

20

30

30

30

40

40

40

50

50

50

OO

OO

OO

M1 M2 M3 M4 ST1 ST2 ST3 PGM

L

L

L

L

R

R

R

R

CLF OUT

CLF OUT

L/M

L/MRL/M

L/M

M4

ST3

ST5

ST1

INSERT

0
10

GAIN

0

40

MIC

50

LINE

-10 26

100Hz

HF

12kHz

-15

+15

650
500
200

120Hz

-15MF+15

LF

80Hz

-15 +15

=

PAN

LR

PEAK
SIGNAL

PFL

PGM

FDR

0

5

10

15

20

30

40
50

OO

ST7

R

R

R

TELCO 1

TELCO 2

ST4

ST6

ST2

0

0

0

5

5

0

0

GAIN GAIN

5

5

5

-15

-15

-15

20

RETURN

-1O 26

-1O 26

AUX+MONO

+15

+15

+15

ST2

ST4

ST6 (USB)

AUDITION

120Hz

120Hz

1/2

3/4 5/USB

HPF

HPF

USB SOURCE SELECT

MIX B

ST3

ST5

ST1

20Hz6kHz

20Hz6kHz

0

0

0

0

ST5

ST3

ST1

ST7

5

5

5

5

-15

-15

-15

-15

LPF

LPF

700Hz20k

700Hz20k

+15

+15

+15

+15

HF

HF

HF

HF

12kHz

12kHz

12kHz

12kHz

TALKTALK

-15+15

-15 +15

-15 +15

-15+15

AUDITION

AUDITION

LF

LF

LF

LF

CLF SCE

CLF SCE

80Hz

80Hz

80Hz

80Hz

AUX AUX

-15+15

-15 +15

-15 +15

-15+15

PGMPGM

=

=

=

=

=

=

PAN

PAN

BAL

BAL

BAL

BAL

LR

LR

LR

LR

LR

LR

REM MUTE REM MUTE

+START/CUE +START/CUE +ST ART/CUE +STAR T/CUE

PEAK

PEAK

PEAK

PEAK

PEAK

PEAK

SIGNAL

SIGNAL

SIGNAL

SIGNAL

SIGNAL

SIGNAL

PFL

PFL

PFL

PFL

PFL

PFL

PGM

PGM

PGM

PGM

PGM

PGM

FDR

FDR

FDR

FDR

FDR

FDR

0

0

0

0

0

0

5

5

5

5

5

5

10

10

10

10

10

10

15

15

15

15

15

15

20

20

20

20

20

20

30

30

30

30

30

30

40

40

40

40

40

40

50

50

50

50

50

50

OO

OO

OO

OO

OO

OO

T2

T1

ST4

Music sources

Sound sources

AUD OUT

INSERT L

L

L
MAIN
PGM
OUT

R

INSERT R

EXT MON IN

R

L

AUX

MONO

R

OUT

GUEST PHON ES 1 GUEST PHO NES 2 CRM PHON ES

USB

SEND

POWER

+16

+16

48V

+9

+9

+6

+6

ON

+3

+3

0VU

0VU

PGM MIX

-12

-12

-16

-16

-20

-20

-30

-30

L

R

PFL ACTIVE

&

AUD

AUX

EXT
MON
USB

ALLEN HEATH

IN

CRM+PHONES

GUEST PHONES

MIX B

SELECTION

SELECTION

CRM

SPEAKERS

PFL ENABLE

TO GUEST

MIN MAX

TALK

DIM SPKS

TO GUEST

CUT SPKS

MIC FADER UP
=CUT SPKS

GUEST

CRM

PHONES

PHONES

MIN MAX

MIN MAX

MIN MAX

MIN MAX

MIN MAX

AUDMIX B LEV

EX MON

PGM MIX
FADER

0

5

10

15

20

30

40
50

OO

Control Room

CD

CD

Jingle

Limit

Computer for sound

sources and

recording via U S B

KEY

Microphone signals to mono inputs
Telephone line in (or exchange)
Line level to/from telephone module
Line level stereo signals
Headphone signals
PGM inserts to limiter
Program mix for transmission
USB lead

Compressor/Limiter

TX 1

Broadcast
Transmission
Method

Separate studio & control
room setup.

Allen & Heath 32 XB-14 MK2 User Guide

APPLICATION TIPS: OFF-AIR CALL RECORDING

This diagram shows the basic mixer setup using the Audition bus to rec­ord an interview with a telephone caller off-air, whilst playing music
through stereo channel ST1. The interview could be recorded from the
Audition out phono connectors or via the USB port as shown here.

CD

MIX B OUT

CRM SPEAKERS

RETURN

ST7

12kHz

80Hz

USB SOURCE SELE CT

-15

HF

LF

BAL

ST7

0

-15 + 15

-15 + 15

OO +6

=

LR

PEAK
SIGNAL

L

R

AUX+ MONO

AUDITION

MIX B

+15

PRE

PFL

PGM
FDR

ST4

R

USB

SEND

5

0

5

10

15

20

30

40
50
OO

AUD OUT

EXT MON I N

GUEST PHONES 1

48V

PGM MIX

DIM SPKS

CUT SPKS

MIC FA DER UP
= CUT SPKS

MIN MAX

EX MON

L

R

L

R

GUEST PHONE S 2 CRM PHONES

ON

CRM+ PHONES

SELECTION

CRM

SPEAKER S

MIN MAX

CRM

PHONES

MIN MAX

MIN MAX

INSE RT L

INSE RT R

AUX

POWER

+16

L

PFL ACTIVE

MIX B LEV

L
MAIN

PGM
OUT

R

MONO

OUT

+16

+9

+9

+6

+6

+3

+3

0VU

0VU

-3

-3

-6

-6

-9

-9

-12

-12

-16

-16

-20

-20

-30

-30

R

AUD

AUX

EXT
MON

USB

IN

MIX B

GUEST PHONES

SELECTION

PFL ENABLE
TO GUEST

TALK

TO GUE S T

&

ALLEN HEATH

Notes:

GUEST

PHONES

MIN MAX

MIN MAX

AUD

PGM MIX

FADER

0

5

10

15

20

30

40
50
OO

PGM

Ensure Audition buttons
are pressed and audition
lights are on for the off­air channels

Switch the CLF source for
the caller to Audition.

Select Audition to USB if
recording to computer.

The producer can monitor
either the live program or
the off-air interview using
the CRM selection switch­es.

ST2

ST1

0

+15

ST2

1/2

ST1

0

+15

PRE

OO +6

=

LR

PFL

PGM
FDR

L

R

L/M

R

5

5

0

5

10

15

20

30

40
50
OO

ST4

ST3

12kHz

HF

LF

80Hz

BAL

-15

ST4

ST3

-15

-15 + 15

-15 + 15

PEAK
SIGNAL

ST4

L

R

L/M

ST3

R

0

5

+15

3/4 5/USB

0

5

+15

PRE

OO +6

=

LR

PFL

PGM
FDR

0

5

10

15

20

30

40
50
OO

ST6

ST5

12kHz

-15

-15

HF

LF

80Hz

BAL

ST6 (USB)

ST5

-15 + 15

-15 + 15

PEAK
SIGNAL

TEL IN

CLF OUT

TELCO 1

5

0

10

-5

20

-1O

26

120Hz

HPF

20Hz 6kHz

3k

LPF

700Hz

20k

AUDITION

CLF SCE

AUX AUX

PRE

OO +6

=

PAN

LR

REM MUTE REM MUTE

PEAK
SIGNAL

PFL

PGM
FDR

0

5

10

15

20

30

40
50
OO

T1

TEL IN

CLF OUT

TELCO 2

ST2

5

0

10

-5

-15

20

-1O

26

120Hz

20Hz 6kHz

3k

ST1

-15

700Hz

20k

HF

12kHz

TALKTALK

-15 + 15

AUDITION

LF

80Hz

PGMPGM

-15 + 15

PRE

OO +6

=

BAL

LR

+ START/ CUE + START/CUE +STA RT/CUE +STA RT/CUE

PEAK

PEAK

SIGNAL

SIGNAL

PFL

PGM
FDR

0

5

10

15

20

30

40
50
OO

T2

MIC MIC

LINE LINE

M1

INSE RT

M1 M2 M3 M4 T1 T2

0

0

10

20

20

30

10

GAIN

LINE

HF

12kHz

LF

80Hz

AUX

PAN

10

GAIN

0

0

40

MIC

MIC

50

LINE

-6-10 63 26

-6-10 63 26

100Hz

HF

12kHz

+15

-15

-15

650

650

1k

500

500

200

200

2k
3k

120Hz

120Hz

4k

-15MF+15

-15MF+15

LF

80Hz

-15 + 15

-15 + 15

PRE

AUXAUXAUXAUXAUXAUXAUXAUXAUX

OO +6

OO +6

MIX B
BUS BUS BUS BUS BUS BUS BUS BUS BUS BUS

=

PAN

LR

LR

AUD AUD AUD AUD AUD AUD AUD AUD AUD AUD

REM MUTE REM MUTE REM MUTE REM MUTE

PEAK

PEAK

SIGNAL

SIGNAL

PFL

PGM
FDR

0

5

10

15

20

30

40
50
OO

MIC MIC

LINE LINE

M4

M3

M2

INSE RT

0

10

20

30

10

GAIN

0

40

MIC

50

LINE

-6-10 63 26

100Hz

HF

12kHz

+15

-15

1k

500

200

2k

3k

120Hz

4k

-15MF+15

LF

80Hz

-15 + 15

PRE

OO +6

MIX B MIX B MIX B MIX B MIX B MIX B MIX B MIX B MIX B

=

PAN

LR

PEAK
SIGNAL

PFL

PGM
FDR

0

5

10

15

20

30

40
50
OO

INSE RT

INSE RT

0

10

10

20

30

30

10

GAIN GAIN

GAIN

0

40

40

MIC

50

50

LINE

-6-10 63 26

100Hz

100Hz

HF

12kHz

+15

650

1k

4k

PRE

=

PFL

PGM
FDR

HPF

+15

-15
650

1k

500

200

2k

2k

LPF

3k

3k

120Hz

4k

-15MF+15

LF

80Hz

CLF SCE

-15 + 15

PRE

OO +6

=

PAN

PAN

LR

PEAK
SIGNAL

PFL

PGM
FDR

0

0

5

5

10

10

15

15

20

20

30

30

40

40

50

50

OO

OO

M1 M2 M3 M4 ST 1 ST2 ST3

ST5

0

+15

0

+15

PRE

OO +6

=

LR

PFL

PGM
FDR

L

R

L/MRL/M

5

5

0

5

10

15

20

30

40
50
OO

Allen & Heath 33 XB-14 MK2 User Guide

FIXING TO A RACK OR FURNITURE

The XB-14 can be fitted to a 19” rack or incorporated into studio furniture using the op tional 19” rack fixing kit.
The following pictures give you an idea of how the rack fixing kit is fitted to the XB-14.

Should you decide to purchase the kit, please follow the fitting instruct ions provided with the kit.

The rack mounting kit part number is: ZED1402-RK19

Allen & Heath 34 XB-14 MK2 User Guide

Insert cable wiring

WIRING NOTES

PR OCESSOR

INSERT

S

T

R

GROUND

RETURN

SEND

General Wiring Information

Y-Adapter

2 Outputs to 1 Input

RETURN

T

S

R

SEND

T

S

R

LINK RING TO SLEEVE TO UNBALANCE

RCA P HONO CA BLE

UNBALANCED

RCA phono jacks

adapter

OUT

IN

Y-Adapter

1 Output to 2 Inputs

No !

TO

INPUT

Tip=hot (+ )

2= hot (+ )

3= cold (-)

Tip=hot (+ )

2= hot (+ )

3= cold (-)

Sleeve= ground

Ring= cold (-)

1= ground

Sleeve= ground

Ring= cold (-)

1= ground

UNBALANCED

BALANCED

BALANCED

XLR MALE

BALANCED

BALANCED

XLR MALE

INSTRUMENT CABLE

TRS JACK CABLE

MIC CABLE

TRS to XLR-F CABLE

TRS to XLR-M CABLE

BALANCED

XLR FEMALE

BALANCED

XLR FEMALE

UNBALANCED

BALANCED

Sleeve= ground

BALANCED

Sleeve= ground

Ring= cold (-)

Tip= hot (+ )

1= ground

3= cold (-)

1= ground

3= cold (-)

Ring = cold (-)

Tip= hot (+ )

2= hot (+ )

2= hot (+ )

Yes

FROM

OUTPUT

Allen & Heath 35 XB-14 MK2 User Guide

PRODUCT SUPPORT

Investigate ALLEN & HEATH’s other ranges at www.allen-heath.com

Large Live Sound mixers — iLive digital, ML and GL Series

Small Format Live Sound mixers — ZED, MixWizards , PA Series, XB

DJ products — Xone Series

Sound Management Series — iDR Series

Registering your product

Thank you for buying the Allen & Heath XB-14 mixer. We hope that you are happy with it and that you
or your end users enjoy many years of faithful service with it.

Please go to www.allen-heath.com/register.asp and register your product’s serial number and your details.
By registering with us and becoming an official Registered User, you will ensure that any warranty claim
you might make is actioned quickly and with the minimum delay.

Alternatively, you may either copy or cut off this section of the page, fill in the details, and return it by
mail to:
Allen & Heath Ltd, Kernick Industrial Estate, Penryn, Cornwall TR10 9LU, UK



Allen & Heath 36 XB-14 MK2 User Guide

SERVICE OPTIONS

CAUTION
These servicing instructions are for use by qualified service

personnel only. To reduce the risk of electric shock do not
perform any servicing other than that contained in the oper-

CAUTI ON

ating instructions unless you are qualified to do so.

The XB-14 mixer has a versatile architecture which should satisfy most
applications that you may encounter without modification. However,
the following internal options provide alternative settings for those
applications that may demand them.

Access is required to internal assemblies. There are a mixture of plug­gable jumpers, cuttable wire links and solder bridge options inside the
unit that can be modified to change mixer functionality.

NOTE: We advise that the modifications below are carried out by

an authorised Allen & Heath service centre. The following information
is provided to give the user an idea of how the console can be modified
if required.

The diagram below shows the mixer with the rear cover removed.
Modifications to the rear mounted boards are relatively straightfor-

ward and can be done in situ. Jumper options on the channel boards
can also be changed with a pair of pliers or tweezers.
Cut and solder links on channel boards are best performed by remov­ing the relevant channel beforehand.

METER

GUEST

ADDITIVE

MIX OPTION

MASTER

FADERMIC

MICCOMMS

MUTE

MIX

CRM

ADDITIVE MIX

OPTION

MIX B / REC OUT SOLDER OPTION

MIC FADER MUTE

COMMS MIC MIX

MIX

CN17

JP7

JP8

BYPASS

CN16

PGM FADER

BYPASS
PROGRAM
FADER

STEREO

AUX

TELCO

INPUT
OPTION

JP2JP3

JP4JP1

AUX

AUX

MONO

AUX

AUD FDR STRT

AUD FDR STRT

Allen & Heath 37 XB-14 MK2 User Guide

SERVICE OPTIONS

Cut and solder option

SOLDER BLOB
HERE

CUT TR AC K
HERE

NOTE: when cutting
track ensure cut lines
don't extend beyond
marked area

JP1

JP4

JP3

Stereo channel jumpers

JP8

CN16

PGM FADER

BYPASS

JP7

CN17

Additive mix options

Add a solder bridge to each pair of pads

M1 M2 M3 M4 M1 M2 M3 M4

COMMS

MIC

MIX

JP2

FADERMIC

MUTE

AUX Pre ON switch / Pre fade option (Mono, Telco and stereo

channels)

This is a cut and solder link that sets the action of the AUX pre
switch when it is in the down position.
The default setting is prefade which sources the audio signal after
the ON switch but before the channel fader. The optio n when mod­ified sources the signal pre ON switch and post EQ.

Audition fader start option

(Mono and telco channels only)

Cut and solder link. The default for this option is to disable the
channel fader start signal if the audition bus button is depressed. If
the fader start option is required with the audition bus then cut and
re-solder this link.

Stereo channel input option

(channels ST1 - 3 only)

This option enables the stereo sources for these channels to be
mixed and fed into the channel together. Simply move the position
of all 4 jumpers to their opposing position to enable this option.
The red gain pots can still be used to set relative levels. The green
selection LEDs will both stay on to indicate that both channels are
being mixed. The main channel fader now controls both inputs.

Program fader bypass

(Mix PCB)

By moving the position of these 2 jumpers, the main program fader
will be bypassed. This eliminates the possibility of the program fader
being accidentally pulled down.

CRM / Guest additive mix option

(Master & meter PCBs)

By bridging all eight solder links on the master and meter PCBs re­spectively, the feed selection buttons on the right hand side of the
mixer are changed from priority mix to additive mix. The default
setting is priority mixing where pressing a button higher up on the
mixer cuts the previous signal to listen to the selected signal.
In additive mixing mode the bottom button still priority switches
between the main program mix and Mix B but all other feeds are
mixed in to the signal when pressed.

Mix B / Rec out solder option

(Distribution PCB)

Cut and solder link. Cutting and re-soldering these 2 links changes
the Mix B out phono sockets to provide a pre fader program mix
for recording purposes.

Comms mic mix option

(Logic PCB)

Cutting or adding wire links here determines the source of the mi­crophone signal that is used to talk to telephone callers and studio
guests with the mixer talk buttons. The signal is sourced after the
channel gain pot and so is not affected by the channel faders. A sin­gle source or a mix of sources can be used. The default is M1.

Mic fader mute option

(Logic PCB)

Cutting or adding wire links here selects which microphone chan­nels will mute the control room speakers when a channel fader is
raised and the corresponding ON switch depressed. The default is
that all mic channels will mute the control room feed but any com­bination can be used.

Allen & Heath 38 XB-14 MK2 User Guide