owner’s manual
X-Rack rack mount mixers
XRM -
12 Output Monitor Mixer
1
Save the carton and packing materials!
Should you ever need to ship the unit,
use only the original factory packing.
For replacement packaging, call Crest Audio’s
Customer Service Depar tment directly.
2
Read all documentation before
operating your equipment. Retain all
documentation for future reference.
3
Follow all instructions printed on
unit chassis for proper operation.
4
Do not use the unit if the electrical
power cord is frayed or broken.
The power supply cord should be routed so that it is not likely to be walked on
or pinched by items placed upon or
against it.
5
Always operate the unit with the
AC ground wire connected to the
electrical system ground. Precautions
should be taken so that the means of
grounding of a piece of equipment is not
defeated.
6
Damage caused by connection to
improper AC voltage is not covered
by any warranty.
7
Do not spill water or other liquids
into or on the unit, or operate the
unit while standing in liquid.
8
The power cord of equipment
should be unplugged from the outlet when left unused for a long period of time.
Service Information
Do not open unit!
Opening the unit will expose you to
potentially dangerous voltages.There are
no user serviceable par ts inside.
Equipment should be serviced by
qualified service personnel when:
A. The equipment has been exposed to rain.
B. The equipment does not appear to oper-
ate normally, or exhibits a marked change in
performance.
C. The equipment has been dropped, or the
enclosure damaged.
To obtain service:
contact your nearest Crest Audio
Service Center, Distributor, Dealer,
or Crest Audio at 201.475.4600
USA
or visit www.crestaudio.com for additional information.
email techser ve
@crestaudio.com
This symbol is used to alert
the operator to follow important
procedures and precautions
detailed in documentation.
This symbol is used to warn operators that uninsulated “dangerous
voltages” are present within the
equipment enclosure that may
pose a risk of electrical shock.
XRM owner’s manual
Important precautions
4
1
2
3
Master section P .29
Solo and Monitoring System, Output Masters.
Front panel controls and rear panel connectors.
Stereo Input channels p.19
Front panel controls and rear panel connections
Mono Input channels p. 7
Front panel controls and rear panel connections
table of contents
Introduction
Thank you and congratulations on your purchase of your new
Crest Audio X-Rack mixer.We’re confident that you will enjoy
many years of trouble-free service from it.You will quickly find
that it fits into a wide variety of mixing applications with ease.
Due to well thought out sets of features, coupled with intelligent circuit design and the highest standards in construction &
workmanship, all Crest Audio console products excel above and
beyond the competitor’s products, in every area.
This owner’s manual covers the XRM X-Rack mixer.The XRM
has 12 Mono inputs and 4 Stereo inputs, adding up to a total of
20 microphone inputs. Each input can feed any of 12 outputs.
Please read this manual thoroughly and keep it handy for future
reference. If you have any operating concerns that are not covered in this manual, or have application questions of any type,
don’t hesitate to contact Crest Audio directly either by phone,
fax, or email. Here is our technical support contact information:
Phone: (201) 475-4600
Fax: (201) 475-4677
Email: techserve@crestaudio.com
Specifications P. 4 1
XRM owner’s manual
p.4
XRM block diagram
BUS IN
ODD MIX
SEND / RTN
MIX INSERT
PRE
XRM MIX PAIR
1 OF 6 PAIRS SHOWN
HPF
HPF
40Hz
-18dB/Oct
AFFECTS BOTH
ODD
MIX AMP
-
MAIN
CABLE
40 WAY
RIBBON
M1
M2
SOLO DC
SOLO RIGHT
TO
PEAK
12 MONO INPUTS AVAILABLE
BAL XLR
CIRCUIT
IN
__
LEV / LEV
LEV / PAN
SWITCHING
MIX SENDS 1 & 2
PRE
MIX 1-4
MUTE
LEVEL LEVELFREQ LEVEL
FREQ
LEVEL
HPF
70Hz
-18dB/Oct
GAIN
10 - 70 dB
LINE
(MIC PAD)
SPLIT
EQ ON
SOLO LEFT
PFL
XRM MONO INPUT MODULE
+48V ON
ODD
FADER
SIG/PK
AFL-ODD
ON
LO-CUT
ODD & EVEN
PAIR
STEREO
M3
LEV / LEV
MIX SENDS 3 & 4
FADER AMP
CHAN
FADER
12 KHZ400 - 8 KHZ80 - 2 KHZ80 HZ
LF LOW MID HI MID HF
HPF
OUT
BAL OUT
ODD MIX
POST
FADER
+10
FADER
R
LED
(AFL)
PEAK
M4
__
LEV / PAN
SWITCHING
+10
FOUR BAND EQ
INPUT
PREAMP
PIN 1 LIFT
60MM
SIG
CTRL TO
STEREO PAIR
INPUT SENDS
M5
LEV / LEV
MIX SENDS 5 & 6
YES
SOLO
TRIGGER
LED
INPUT
SIGNAL
PAD
26dB
G
__
SOLO LEFT
M6
LEV / PAN
PRE
SOURCE
R
(PFL)
PEAK
BAL LINE IN
SOLO
SOLO RIGHT
SWITCHING
MIX SENDS 7 & 8
MUTE ?
LOGIC
NO
PRE
SIG
&
SWITCH
SOLO DC
M7
__
LEV / LEV
PRE
EQ
G
BUS IN
EVEN MIX
M8
LEV / PAN
FADER
INSERT
SEND / RTN
SWITCHING
MIX SENDS 9 & 10
BUFFER
PRE-SOURCE
POST
FADER
PRE
AFL-EVEN
M9
LEV / LEV
FADER
M10
__
LEV / PAN
PRE
SEND / RTN
MIX INSERT
EVEN
MIX AMP
SWITCHING
MIX SENDS 11 & 12
SELECT
PRE-SOURCE
INSERT
REAR PANEL
HPF
M11
__
LEV / LEV
PRE
FADER
HPF
40Hz
M12
LEV / PAN
SWITCHING
-18dB/Oct
EVEN
SIG/PK
EVEN MIX
FADER
LED
BAL OUT
POST
PFL
FADER
+10
60MM
R
G
SIG
(AFL)
PEAK
SOLO LEFT
SOLO RIGHT
PRE
4 STEREO INPUTS AVAILABLE
XRM STEREO INPUT MODULE
+48V ON
FADER
SOLO DC
TO
PEAK CIRCUIT
GAIN
15 - 60 dB
LINE
(MIC PAD)
IN
BAL XLR
MIX SENDS 1 & 2
PRE
MIX 1-4
POST
FADER
SUM
MUTE
LEVEL LEVELFREQ LEVEL
FREQ
LEVEL
MONO
LEFT
M1
__
LEV / LEV
M2
LEV / PAN
SOLO AND MONITOR CIRCUITS
SWITCHING
MIX SENDS 3 & 4
AMPS
FADER
CHAN
LEVEL
EQ ON
12 KHZ400 - 8 KHZ80 - 2 KHZ80 HZ
LF LOW MID HI MID HF
OUT
SPLIT
MONITOR
630-36
9
1215182124
+9
LED
METERS
FOLLOW SOLO
SOLO
MIX AMPS
SOLO LEFT
M3
M4
__
LEV / LEV
LEV / PAN
SWITCHING
LEFT
+10
+10
FOUR BAND EQ - LEFT
LF LOW MID HI MID HF
EQ
PRE
PIN 1 LIFT
BAL XLR
OUT - L
L - R
FEED
SOLO
SOLO RIGHT
M5
M6
__
LEV / LEV
LEV / PAN
SWITCHING
MIX SENDS 5 & 6
RIGHT
12 KHZ400 - 8 KHZ80 - 2 KHZ80 HZ
FOUR BAND EQ - RIGHT
RIGHT
IN
ON
SPEAKER
ON
PWR
ON
SOLO
SOLO
CONTROL
LOGIC
SOLO DC
M7
M8
__
LEV / LEV
LEV / PAN
MIX SENDS 7 & 8
PRE
MUTE ?
SOURCE
YES
SOLO
INPUT
INPUT
PREAMP
OUT
SPLIT
MONITOR
SWITCHING
PRE
FADER
NO
PRE
FADER
PRE-AMP
TRIGGER
LED
SIGNAL
26dB
OUT - R
LEVEL
MONITOR / HP
M9
M10
__
LEV / LEV
LEV / PAN
MIX SENDS 9 & 10
SUM
LEFT
PRE-SOURCE
EQ
PRE
PRE
LEFT
OUT
L & R
R
SIG
(PFL)
PEAK
PAD
BAL LINE IN
JACK
HEADPHONE
AMP
HEADPHONE
L
SWITCHING
BUFFERS
PRE
FADER
RIGHT
POST
G
PAD
26dB
R
M11
M12
__
LEV / LEV
LEV / PAN
SWITCHING
MIX SENDS 11 & 12
RIGHT
SELECT
PRE-SOURCE
EQ
L & R
FADER
PRE
L & R
FADER
REAR PANEL
INPUT - L
COMMON
INPUT - R
COMMON
COMMON INPUT CIRCUITRY
INPUT
LEVEL
COMMON
L
R
ODD
MIX BUSES
13579
OBE
XLR
RCA
1/4” TRS
ELECT
FET
BLOB
SOLDER
LINK
FITTED
PANEL
AMP
GAIN
BALANCED
GC
GROUND COMP
BICOLOR
P
ROTARY
EVEN
MIX BUSES
246
8
10
12
11
FRANK
LEGENDS
JACK
JACK
JACK
SWITCH
SWITCH
USER OPTIONS
STANDARD OUTPUT LEVEL IS +4 dBu AT 0 VU
PIN 2 HOT ON ALL BALANCED INPUTS AND OUTPUTS (XLR JACKS)
FOR UNBALANCED OPERATION:
TIE PIN 3 TO PIN 1, USE PIN 2 FOR OUTPUT, PIN 1 FOR GND
“Ø” SYMBOL INDICATES POLARITY REVERSE
SWITCH
DRIVER
DRIVER
LED
FADER
POT PAD LED
ALL SWITCHES SHOWN IN THE UP (DESELECTED) POSITION
AMP(LIFIER) GAIN SHOWN IN DB WHEN NEEDED
WHEN SHOWN: 1/4” TRS SWITCHING JACKS HAVE NORMALLY CLOSED CONTACTS
USER OPTIONS IMPLEMENTED WITH REMOVABLE LINKS AND SOLDER BLOBS
DEFAULT OPTION POSITION SHOWN UNDERLINED
XRM BLOCK DIAGRAM
SOLO-LINK:
CONTROL BETWEEN
TIES SOLO AUDIO AND
SOLO
Use 5-Pin DIN cable to
interconnect two Consoles
SOLO-LINK CONNECTORS.
USE 5-PIN DIN CABLE FROM
BNC CONNECTOR
FOR 12VOLT LAMP
( ON FRONT PANEL )
POLY
FUSES
CONSOLE.
SHOW UP ON MASTER
CONSOLES. SLAVE SOLOS
LINK
IN OUT
SLAVE CONSOLE OUT
TO MASTER CONSOLE IN
PROTECTION
SHORT-CIRCUIT
ON
AC INLET & SWITCH
X-RACK REAR PANEL:
RIBBONS
TO POWER
DC OUTPUT
DISTRIBUTION
-17V
+48V
+12V
+17V
AUX DC
ANALOG
GROUND
GROUND
CHASSIS
GROUND
INTERNALLY FUSED AND
SHORT-CIRCUIT PROTECTED
UNIVERSAL INPUT-VOLTAGE
SWITCHING POWER SUPPLY
SAFETY
GROUND
TO CHASSIS
POWER
240V
80W
-
AC IN
50/ 60 Hz
100
XRM BLK DIA-REV1.0 - 5/20/02
how to use this manual
format
This manual uses a format that is intended to be easy to read, yet technical for those
who need to know all the details. For feature descriptions, this is done by devoting the
left side of each page to 1) an overall module picture, 2) a block diagram, and 3) a control closeup.These images all per tain to the features and control descriptions on the
right side of the page.The intention is to make the manual easy to read while including
all the technical details needed for getting the most out of the X-Rack - a compact, flexible, feature-rich addition to Crest Audio's growing line of audio mixing console products.
conventions
Control Icons
This manual uses symbols to illustrate what the control descriptions are referring to.This
makes it possible to avoid redundant wording and makes the control descriptions clear.
Switch in the UP, non-activated position
Switch in DOWN, activated position
Switch that illuminates when in the DOWN position
Momentary switch that illuminates when activated
LED that is on, indicating that it's associated feature is activated
Potentiometer
Standard 1/4" TRSjack (used for line level inputs)
1/4" TRSjack with normal switching (used on inser ts)
Female XLR input jack
Male XLR output jack
p.5
LED
+
T= IN
–
R= IN
S= GND
T= Send
R= Return
S= GND
Mono input channel
1
p.6
XRM owner’s manual
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6
500
500500500
N
G
L
Module
Block diagram
Controls
40
GAIN
20
105070
LO CUT
0
+–
HF
88
1515
2K
3K
1K
5K
600
400
8K
0
HM
+–
88
1515
500
300
1K
100
2K
0
LM
+–
88
1515
0
+–
LF
88
1515
EQ
1
ON
MIX SENDS
PRE
–
10
1
0
+
20
3
S
30
T
R
40
6
•
–
10
2
0
+
20
3
30
40
6
•
–
10
3
0
+
20
3
S
30
T
R
40
6
•
–
10
4
0
+
20
3
30
40
6
•
–
10
5
0
+
20
3
S
30
T
R
40
6
•
–
10
6
0
+
20
3
30
40
6
•
–
10
7
0
+
20
3
S
30
T
R
40
6
•
–
10
8
0
+
20
3
30
40
6
•
–
10
9
0
+
20
3
S
30
T
R
40
6
•
–
10
10
0
+
20
3
30
40
6
•
–
10
11
0
+
20
3
S
30
T
R
40
6
•
–
10
12
0
+
20
3
30
40
6
•
MUTE
1
CHAN
LEVEL
–
10
0
+
20
5
30
40
10
•
PK
SIG
PFL
+48V ON
BAL XLR
IN
SPLIT
OUT
PIN 1 LIFT
BAL LINE IN
INSERT
SEND / RTN
REAR PANEL
26dB
PA D
LINE
(MIC PAD)
GAIN
10 - 70 dB
INPUT
PREAMP
HPF
70Hz
-18dB/Oct
HPF
LINE INPUT
(
40
20
105070
0
PEAK
(PFL)
SIG
MIC PAD
GAIN
LO CUT
I
SI
)
Front panel features
Line Input (Mic Pad)
With this switch in the UP position, the input preamp circuit is set up to accept a mic-level
signal. This signal is brought in via the XLR mic-input connector located on the rear panel.The
1/4" TRS input jack is ignored.
When the switch is depressed, a Pad is inserted into the signal path and the input preamp
circuit is set up to accept a line-level signal from either the XLR mic-input connector or the 1/4"
TRS input jack, both located on the rear panel.The XLR signal is normal'd to the 1/4” TRS jack. If
nothing is plugged into the TRS jack, the XLR signal is fed to the preamp when the LINE switch is
pressed. Since the TRS signal is always padded down by 26dB, this feature allows the LINE switch
to act as a PAD switch for bringing a very hot microphone signals down to a controllable level,
avoiding overload.When a plug is inserted into the 1/4" TRS input jack, the XLR mic-input signal is
disconnected and the signal present on the 1/4” plug is fed to the preamp. If plugs are inserted
into both the XLR and TRS jacks, this switch acts as an input selector switch between the two
jacks.
Gain
The Input gain control is used to establish proper gain structure in the channel. For best
results, use the Solo system to monitor the channel while you set the gain.The goal is maximum
gain without distortion. Both the main LED meters (during Solo) and the channel’s Level/Peak
indicator can be used for adjusting gain.
70 Hz Lo-Cut filter
This filter reduces or eliminates unwanted low frequencies without substantially affecting the program material. Quite often, such unwanted low frequencies are included with mic- or line-input
signals. For example, stage rumble or wind can be picked up through vocal mics.The cut-off frequency of the filter is 70 Hz and the slope is -18dB per octave.This type of filter is also referred
to as a Hi-pass filter (HPF). It allows the hi-frequencies to pass, but stops the lo-frequencies.
Lo Cut Switch
Lo-Cut filter is bypassed.
Lo-Cut filter is on.
Mono Input channel
1
p.7
Mono input channel
1
p.8
XRM owner’s manual
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2
3
2
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1
0
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3
2
3
2
3
2
3
2
3
2
3
4
2
3
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2
3
4
2
3
4
2
3
4
2
3
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8
8
8
0
0
500
M
Module
Block diagram
Controls
40
GAIN
20
105070
LO CUT
0
+–
HF
88
1515
2K
3K
1K
5K
600
400
8K
0
HM
+–
88
1515
500
300
1K
100
2K
0
LM
+–
88
1515
0
+–
LF
88
1515
EQ
1
ON
MIX SENDS
PRE
–
10
1
0
+
20
3
S
30
T
R
40
6
•
–
10
2
0
+
20
3
30
40
6
•
–
10
3
0
+
20
3
S
30
T
R
40
6
•
–
10
4
0
+
20
3
30
40
6
•
–
10
5
0
+
20
3
S
30
T
R
40
6
•
–
10
6
0
+
20
3
30
40
6
•
–
10
7
0
+
20
3
S
30
T
R
40
6
•
–
10
8
0
+
20
3
30
40
6
•
–
10
9
0
+
20
3
S
30
T
R
40
6
•
–
10
10
0
+
20
3
30
40
6
•
–
10
11
0
+
20
3
S
30
T
R
40
6
•
–
10
12
0
+
20
3
30
40
6
•
MUTE
1
CHAN
LEVEL
–
10
0
+
20
5
30
40
10
•
PK
SIG
PFL
10 7 0
LO CUT
0
+–
HF
88
1515
6
3
1K
600
400
2K
3K
5K
1
6
8K
0
HM
+–
88
1515
500
300
100
2K
0
3
1K
LM
+–
88
1515
0
+–
LF
88
1515
EQ
1
ON
MIX SENDS
PRE
XRM MONO INPUT MODULE
12 MONO INPUTS AVAILABLE
LEVEL
FREQ LEVEL LEVELFREQ LEVEL
LF LOW MID HI MID HF
12 KHZ400 - 8 KHZ80 - 2 KHZ80 HZ
FOUR BAND EQ
EQ ON
CHAN
FADER
Front panel features
Equalizer (EQ)
Many audio signals coming into the console require some degree of corrective eq in order to be
part of a good sounding mix. XRM offers a 4-Band EQ on each channel.The input EQ consists of
the bands: High, High-Mid, Low-Mid and Low.The High and Low frequency bands are shelving
equalizers, each have a boost/cut control and their frequencies are fixed.The High-Mid and LowMid bands have a bell-shaped response, each band features variable boost/cut and adjustable frequency.
high frequency—HF
Boost / Cut 15dB boost and cut. Shelving @ 12 kHz
high mid—HM
Frequency Continuously variable between 400 Hz and 8 kHz.
Boost / Cut 15dB boost and cut. Bell curve with a BW of approx 1.5 octaves
Low mid—LM
Frequency Continuously variable between 100 Hz and 2 kHz.
Boost / Cut 15dB boost and cut. Bell curve with a BW of approx 1.5 octaves
Low frequency—LF
Boost / Cut 15dB boost and cut. Shelving @ 80 Hz.
EQ on
Equalizer is OFF. The equalizer circuitry is bypassed.
Equalizer is ON. This switch is used to activate the EQ section and can be used to make
A/B comparisons between "flat" and eq'd signals.
p.9
Mono Input channel
1
p.10
Mono input channel
1
XRM owner’s manual
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3
2
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2
3
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3
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2
3
4
2
3
4
2
3
4
2
3
4
2
3
ON
500
R
C
4
Module
Block diagram
Chan SendsChan Fader
20
+
SOLO
PWR
COMMON INPUT
T
Master Faders
40
GAIN
20
105070
LO CUT
0
+–
88
1515
2K
3K
1K
5K
600
400
8K
0
HM
+–
88
1515
500
300
1K
100
2K
0
LM
+–
88
1515
0
+–
88
1515
EQ
ON
MIX SENDS
PRE
–
10
0
+
20
3
30
40
6
•
–
10
0
+
20
3
30
40
6
•
–
10
0
+
20
3
30
40
6
•
–
10
0
+
20
3
30
40
6
•
–
10
0
+
20
3
30
40
6
•
–
10
0
+
20
3
30
40
6
•
–
10
0
+
20
3
30
40
6
•
–
10
0
+
20
3
30
40
6
•
–
10
0
+
20
3
30
40
6
•
–
10
0
+
20
3
30
40
6
•
–
10
0
+
20
3
30
40
6
•
–
10
0
+
20
3
30
40
6
•
MUTE
1
CHAN
LEVEL
–
10
0
+
20
5
30
40
10
•
PK
SIG
PFL
HF
6
3
LF
1
1
S
T
R
2
3
LE
S
T
R
4
5
S
T
R
EVEL
6
7
HF
S
T
R
12 KHZ
8
9
S
T
R
10
11
S
T
R
12
PRE
INSERT
PRE
EQ
EQ ON
CHAN
FADER
PRE
SOURCE
MUTE ?
PRE
FADER
PRE-SOURCE
SELECT
MUTE
FADER AMP
YES
NO
PRE-SOURCE
BUFFER
+10
STR PAIR LO CUT STR PAIR LO CUT
1–23
10
5
0
5
F
1
10
20
30
OUTPUT MASTERS
PK
SIG
234
AFL
TO
PEAK
CIRCUIT
MIX 1-4
PRE
–
4
PFL
MIX SENDS 1 & 2
MIX SENDS 3 & 4
MIX SENDS 5 & 6
MIX SENDS 7 & 8
MIX SENDS 9 & 10
MIX SENDS 11 & 12
30
40
20
30
40
20
30
40
SOLO LEFT
SOLO RIGHT
SOLO DC
LEV / LEV
__
LEV / PAN
SWITCHING
LEV / LEV
__
LEV / PAN
SWITCHING
LEV / LEV
__
LEV / PAN
SWITCHING
LEV / LEV
__
LEV / PAN
SWITCHING
LEV / LEV
__
LEV / PAN
SWITCHING
LEV / LEV
__
LEV / PAN
SWITCHING
3
S
T
R
6
•
–
10
•
12
0
+
3
6
MUTE
1
CHAN
LE VEL
–
10
0
+
5
10
•
PK
SIG
PFL
M1
M2
M3
M4
M5
M6
M7
M8
M9
M10
M11
M12
MIX SENDS
PRE
10
20
30
40
•
10
20
30
40
•
10
20
30
40
•
10
20
30
40
•
10
20
30
40
•
10
20
30
40
•
10
20
30
40
•
10
20
30
40
•
10
20
30
40
•
10
20
30
40
•
10
20
30
40
•
10
20
30
40
•
–
1
0
+
3
S
T
R
6
–
2
0
+
3
6
–
3
0
+
3
S
T
R
6
–
4
0
+
3
6
–
5
0
+
3
S
T
R
6
–
6
0
+
3
6
–
7
0
+
3
S
T
R
6
–
8
0
+
3
6
–
9
0
+
3
S
T
R
6
–
10
0
+
3
6
–
11
0
+
3
S
T
R
6
–
12
0
+
3
6
Front panel features
Mix Send features
The XRM is capable of generating 12 mono mixes, 6 stereo mixes, or a combination of both
mono and stereo mixes. Each of the six Odd/Even pairs of sends can be configured as a stereo
pair- the Odd pot becomes the level control, the Even pot becomes the pan pot.The changeover
to stereo operation is controlled by the STR PAIR switches located above the master faders.A
LO CUT switch is also present for activating the hi-pass filter (40Hz, -18dB/oct) for each pair of
mixes.
Mix 1 - 4 PRE
MIX Sends 1-4 are Post-Fader
MIX Sends 1-4 are Pre-Fader
Normally, the signal feeding the Mix Sends is derived after the main Chan Level Pot (Post-Fader).
This Chan Level pot controls the level of the chan signal feeding the individual Mix Send pots.
Each Mix Send pot is then used to generate a sub-mix of this channel signal.This Post-fader signal
is also affected by the Mute switch; if the channel is muted, the Mix Send no longer receives a signal.There are some cases where an independent mix is desired, the operator doesn’t want the
Chan Level to affect the signal. On the XRM, Mixes 1 thru 4 can be switched to receive their signal PRE the Chan Level pot (Pre-fader).The default PRE setting for Mixes 1-4 is pre-fader, but it is
still post-insert/post-EQ/post Mute. An internal jumper (per channel) can be changed so that the
PRE setting becomes either pre-insert or pre-EQ.Another jumper allows this PRE setting to additionally be independent of the channel mute.
Mix Sends 1 & 2
Levels for Mixes 1 and 2 are controlled by this pair of knobs. In MONO mode, each knob controls the amount of chan signal that is sent to its corresponding mix bus. In Stereo Mode, the top
knob controls the level to both buses and the bottom knob acts as a PAN control between the
two buses- full CCW for Odd, full CW for Even.
STR PAIR sw in the UP position(located above Master Fader 1)
Knob 1: Send level for Mix 1
Knob 2: Send level for Mix 2
STR PAIR sw in the DOWN position
Knob 1: Send level for both Mix 1 and Mix 2
Knob 2: Pan control between Mix 1 and Mix 2
This Send arrangement is repeated for the remainder of the Mix Send
pairs on the channel. Each pair’s operation is controlled by its own STR
PAIR switch located above the corresponding odd-numbered Master
Fader.
p.11
Mono Input channel
1
p.12
Mono input channel
1
XRM owner’s manual
500500500500500500500500500500500500
500500500
2
3
6
•
Module
Block diagram
Controls
40
GAIN
20
105070
LO CUT
0
+–
88
1515
2K
3K
1K
600
400
8K
0
+–
88
1515
500
300
100
2K
0
+–
88
1515
0
+–
88
1515
EQ
ON
MIX SENDS
PRE
–
10
0
20
30
40
6
•
–
10
0
20
30
40
6
•
–
10
0
20
30
40
6
•
–
10
0
20
30
40
6
•
–
10
0
20
30
40
6
•
–
10
0
20
30
40
6
•
–
10
0
20
30
40
6
•
–
10
0
20
30
40
6
•
–
10
0
20
30
40
6
•
–
10
0
20
30
40
6
•
–
10
0
20
30
40
6
•
–
10
0
20
30
40
6
•
MUTE
1
CHAN
LEVEL
–
10
0
20
30
40
10
•
PK
SIG
PFL
MUTE
1
HF
5K
HM
20
30
40
1K
LM
LF
•
10
PK
SIG
CHAN
LE VEL
–
10
PFL
0
+
5
1
1
+
3
S
T
R
2
+
3
3
+
3
S
T
R
4
+
3
5
+
3
S
T
R
6
+
3
7
+
3
S
T
R
8
+
3
9
+
3
S
T
R
10
+
3
11
+
3
S
T
R
12
+
3
+
5
E
VEL
HF
KHZ
PRE
INSERT
PRE
EQ
EQ ON
CHAN
FADER
PRE
SOURCE
MUTE ?
PRE
FADER
PRE-SOURCE
SELECT
MUTE
FADER AMP
YES
NO
PRE-SOURCE
BUFFER
+10
MIX 1-4
PRE
TO
PEAK
CIRCUIT
PFL
MIX SENDS 1 & 2
MIX SENDS 3 & 4
MIX SENDS 5 & 6
MIX SENDS 7 & 8
MIX SENDS 9 & 10
MIX SENDS 11 & 12
SOLO LEFT
SOLO RIGHT
SOLO DC
LEV / LEV
__
LEV / PAN
SWITCHING
LEV / LEV
__
LEV / PAN
SWITCHING
LEV / LEV
__
LEV / PAN
SWITCHING
LEV / LEV
__
LEV / PAN
SWITCHING
LEV / LEV
__
LEV / PAN
SWITCHING
LEV / LEV
__
LEV / PAN
SWITCHING
MAIN
RIBBON
CABLE
-
40 WAY
M1
M2
M3
M4
M5
M6
M7
M8
M9
M10
M11
M12
Front panel features
Channel Level and Control
This next set of controls allows the operator to control and monitor the overall level of the channel
signal.
Mute Sw and LED
The Mute switch kills the channel signal and prevents it from feeding any Mix Send pots.The muteelement itself is a FET transistor, allowing for timed, ramped on-off control of the channel signal.This
avoids any “pops and clicks” when muting a channel. Normally, the Mute will also affect the PRE signals
of the channel (see Mix Send details). PRE can be selected for Mix Sends 1 thru 4, and is normally the
Pre-fader channel signal.There are internal jumpers that allow the user to change the definition of this
PRE signal on a channel by channel basis, or it can be specified at the time of order and reconfigured
during the product build at the factory.The PRE signal can be changed from its normal Pre-Fader setting and redefined as either Pre-Insert or Pre-EQ.Additionally,the mute operation of the PRE signal
can be changed from its default of “Follow Chan Mute” to “Ignore Chan Mute”.Again, this chan by
chan option can be done either by the user or by the factory at the time of order.
Mute Switch UP, LED OFF
Channel is un-muted. Signal is allowed to pass (pre or post fader)to the Mix Send pots.
Mute Switch DOWN,LED ON
Channel is muted.The Post-Fader signal is prevented from reaching the Mix Send pots.The PRE
signal (available for Mix Sends 1-4) is also muted unless the option has been changed to “Ignore Chan
Mute”.
Channel Level Pot
This rotary pot controls the level of Post-Fader signal sent to the individual Mix Sends. Mix Sends 5
thru 12 always receive this Post-Fader signal. Mix Sends 1 thru 4 have the option of selecting a Prefader signal by the use of the PRE button.
Continuously variable from OFF (full CCW) to +10dB gain (full CW).The panel is marked with
the dB level of the channel, 0dB (unity channel gain) is at approx the 2-o’clock position.
PeaK / SIGnal LED
This bi-color LED performs three functions:
1) Chan level; 2) Channel overload; 3) PFL status.
1) Varying intensity Green shows the pre-fader signal level
2) Red warns of channel clipping anywhere within the signal path. 3 points are monitored by the
Peak circuitry: Input preamp,EQ circuit, and Fader amp. If any of these points come within 3dB of
clipping, the LED will illuminate Red.
3) If the Chan PFL button is depressed, the LED will illuminate Red.
PFL Sw (and LED)
The XRM is equipped with a Stereo Solo system. Input Channels are monitored Pre-Fader (PFL), and
outputs are monitored After-Fader (AFL).When a Mono channel is Solo’d,it appears in the Solo
meters and headphone/monitor system as a mono signal (equal level to both sides).The Solo’d signal
is Pre-fader, so the level feeding the Solo system is not affected by the setting of the Chan Lev pot.
Channel Pre-fader signal is sent to the Solo bus and displayed on the Solo meters and can be
heard on the Headphone and Monitor outputs.The chan PK/SIG LED will illuminate RED, indicating
that the PFL button is depressed.The Solo system is additive, so any and all channels that have their
PFL switches depressed will be mixed together and monitored by the Solo system.
p.13
Mono Input channel
1
LED
LED
p.14
Mono input channel
1
XRM owner’s manual
Rear panel
Block diagram
Connectors
S
K
Balanced Line Inputs
For Stereo Channels S1–S4
L
L
Bal
Bal
Input
Input
R
R
+48V
+48V
On
On
S3
S4
PUSH
PUSH
L
L
Input
Input
R
R
PUSH
PUSH
+48V
+48V
On
PUSH
L
Input
PUSH
+48V
On
On
S1
S2
PUSH
Balanced Line In
L
Input
R
R
+48V
On
On
Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In
10
1112
Balanced
Balanced
Balanced
Input
Input
Input
On
On
8
9
Balanced
Balanced
Input
Input
On
On
6
7
Balanced
Balanced
Input
Input
On
On
4
5
Balanced
Balanced
Input
Input
On
On
2
3
Balanced
Input
+48V
+48V
+48V
+48V
+48V
+48V
+48V
+48V
+48V
Balanced
+48V
On
1
Balanced
Input
Input
PUSHPUSHPUSHPUSHPUSHPUSHPUSHPUSHPUSHPUSHPUSHPUSHPUSH
+48V
On
Balanced Line In
In
S1
XLRs
Pin1 Lift
L
L
Bal
Input
R
L
Bal
Split Out
Input
R
R
S4S3S2
+48V ON
BAL XLR
IN
SPLIT
OUT
PIN 1 LIFT
Pin1 Lift
L
XLRs
Split Out
Pin1 Lift
Pin1 Lift
L
L
Split Out
Split Out
R
R
S1S2S3S4
Pin1 Lift
Pin1 Lift
Split Out
Split Out
R
Chan
Chan
11
12
Insert
Insert
Pin1 Lift
Split Out
Chan
10
Insert
(MIC PAD)
Pin1 Lift
Split Out
9
LINE
Chan
Insert
Pin1 Lift
Split Out
Chan
8
Insert
10 - 70 dB
Pin1 Lift
Split Out
Chan
7
Insert
GAIN
Pin1 Lift
Split Out
6
Chan
Insert
Pin1 Lift
Split Out
Chan
5
Insert
-18dB/Oct
Pin1 Lift
4
HPF
70Hz
Split Out
Pin1 Lift
Split Out
Chan
Chan
3
Insert
Insert
HPF
INPUT
PREAMP
Pin1 Lift
Split Out
2
Pin1 Lift
Split Out
Chan
Chan
1
Insert
Insert
ed
ut
1
PUSH
XLRs
Pin1 Lift
Balanced
Input
Split Out
Chan
1
Insert
XLRs
XLRs
XLRs
XLRs
XLRs
XLRs
XLRs
XLRs
XLRs
XLRs
XLRs
XLRs
XLRs
XLRs
26dB
PA D
BAL LINE IN
INSERT
SEND / RTN
REAR PANEL
PEA
(PFL
SIG
p.15
Mono Input channel
1
Rear panel features
+48 V On
+48 volts DC is applied equally (thru current-limiting resistors) to both pins 2 and 3 on the micinput XLR connector.This feature is used with condenser microphones and active direct boxes that
require an external DC voltage (phantom power) in order to operate. For dynamic or ribbon mics,
phantom voltage is not required and should be switched OFF.
NOTE 1: Operating this switch (On or Off) causes large voltage swings to occur at the input of the
mic preamp. Care should be taken to insure that the channel is muted or the main faders are pulled
down to prevent this POP from getting to someone’s ears.
NOTE 2: Pin-1 of the XLR is used as the DC return path for the phantom voltage. If the Pin-1 Lift
switch is depressed (see below), this path is broken and the microphone will no longer receive operating power from the XRM. If the Pin-1 Lift switch must be used (to prevent a ground-loop hum or
other unpleasant sounds when connecting to another mixer), then phantom power must be derived
from a different source; either the other connected mixer (usually FOH) or an external phantom supply.
Line Input jack
Line-level signals, balanced or unbalanced, may be brought into the input channel through this
1/4” TRS jack.The LINE switch (front panel) must be pressed for this jack to be active. On the XRM,
the XLR jack is normal'd to the switching contacts of this jack. If nothing is plugged into the jack, a
padded XLR signal is available to the channel when the LINE switch is depressed.This allows the LINE
switch to perform a dual function: XLR pad if nothing is plugged into the Line jack, or XLR(Mic)/Line
input selection if the jack is being used.
Tip is Positive Input, Ring is Negative Input, Sleeve is Chassis Ground
Input impedance is 20KΩ balanced.
XLR(Mic) Input jack
This balanced, latching, female XLR accepts a low-impedance microphone signal, or a line-level
signal, depending on the position of the LINE INPUT switch on the front panel.
Pin-2 is Positive Input, Pin-3 is Negative Input, Pin-1 is Chassis Ground
Input impedance is 4KΩ balanced
Pin-1 Lift Switch
Pin-1 of both of the XLR jacks is connected to the XRM chassis thru this switch.
This Pin-1 connection serves two main functions:
1) A shield connection point that allows any interference signals (picked up by the cable shield) to be
effectively shunted to ground, thus avoiding signal degradation.
2) A DC return path for the +48 volt phantom power voltage.
Normally, this switch is left in the UP position; Pin-1 is tied to the XRM chassis, and the shielding and
phantom power are both maintained.When the XRM is used by itself, there is usually no reason to
press this switch.When the XRM is used in conjunction with another mixer, either by using the builtin passive splitter, or when fed from an external splitter,there may be situations where ground differences between mixers can cause a “ground-loop”.This usually manifests itself as a low-freq hum (usually at the AC mains freq), a hi-freq buzz, or a combination of both. In most cases, lifting the ground
connection between mixers can clean up this interference.
Pin-1 of BOTH XLR jacks is connected to Chassis ground.
Pin-1 of BOTH XLR jacks is disconnected from Chassis ground.
NOTE 1: The pin-to-pin wiring between the paired XLR connectors is never changed by this switch,
it only disconnects the common, Pin-1 of the XLRs from the mixer chassis, never from one another.
NOTE 2: Remember- if this switch is depressed, it prevents the XRM phantom power from reaching
the attached microphone. Phantom power (if needed) must be supplied from an alternate source.
p.16
Mono input channel
1
XRM owner’s manual
Rear panel
Block diagram
Connectors
S
K
Balanced Line Inputs
For Stereo Channels S1–S4
L
L
Bal
Bal
Input
Input
R
R
+48V
+48V
On
On
S3
S4
PUSH
PUSH
L
L
Input
Input
R
R
PUSH
PUSH
+48V
+48V
On
PUSH
L
Input
PUSH
+48V
On
On
S1
S2
PUSH
Balanced Line In
L
Input
R
R
+48V
On
On
Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In
10
1112
Balanced
Balanced
Balanced
Input
Input
Input
On
On
8
9
Balanced
Balanced
Input
Input
On
On
6
7
Balanced
Balanced
Input
Input
On
On
4
5
Balanced
Balanced
Input
Input
On
On
2
3
Balanced
Input
+48V
+48V
+48V
+48V
+48V
+48V
+48V
+48V
+48V
Balanced
+48V
On
1
Balanced
Input
Input
PUSHPUSHPUSHPUSHPUSHPUSHPUSHPUSHPUSHPUSHPUSHPUSHPUSH
+48V
On
In
Balanced Line In
S1
XLRs
Pin1 Lift
L
L
Bal
Input
R
L
Bal
Split Out
Input
R
R
S4S3S2
+48V ON
BAL XLR
IN
SPLIT
OUT
PIN 1 LIFT
Pin1 Lift
L
XLRs
Split Out
Pin1 Lift
Pin1 Lift
L
L
Split Out
Split Out
R
R
S1S2S3S4
Pin1 Lift
Pin1 Lift
Split Out
Split Out
R
Chan
Chan
11
12
Insert
Insert
Pin1 Lift
Split Out
Chan
10
Insert
(MIC PAD)
Pin1 Lift
Split Out
9
LINE
Chan
Insert
Pin1 Lift
Split Out
Chan
8
Insert
10 - 70 dB
Pin1 Lift
Split Out
Chan
7
Insert
GAIN
Pin1 Lift
Split Out
6
Chan
Insert
Pin1 Lift
Split Out
Chan
5
Insert
-18dB/Oct
Pin1 Lift
4
HPF
70Hz
Split Out
Pin1 Lift
Split Out
Chan
Chan
3
Insert
Insert
HPF
INPUT
PREAMP
Pin1 Lift
Split Out
2
Pin1 Lift
Split Out
Chan
Chan
1
Insert
Insert
ed
ut
1
PUSH
XLRs
Pin1 Lift
Balanced
Input
Split Out
Chan
1
Insert
XLRs
XLRs
XLRs
XLRs
XLRs
XLRs
XLRs
XLRs
XLRs
XLRs
XLRs
XLRs
XLRs
XLRs
26dB
PA D
BAL LINE IN
INSERT
SEND / RTN
REAR PANEL
PEA
(PFL
SIG
p.17
Mono Input channel
1
Rear panel features (continued):
Split-Out XLR jack
This male XLR jack is wired pin-to-pin to the female XLR input jack. In combination with
the female XLR, it forms a passive,Y-Split of the input signal.This split-signal can be used to feed
the mic input to another mixer (usually the FOH mixer), or to “mult” the input to another channel on the XRM.
NOTE: This pin-to-pin connection between XLR jacks is NOT affected by the Pin-1 lift switch.
Chan Insert jack
This switching 1/4” TRS jack allows an external signal processor to be inserted into the
signal path of the channel.The tip carries the SEND signal from the channel, and the ring carries
the RETURN signal back to the channel.The insert-send point is located directly after the Lo-Cut
filter on the channel, the return comes back into the channel at the top of the EQ section.
Tip is Send, Ring is Return, Sleeve is Audio Ground.
Send (output) impedance is 50Ω
Return (input) impedance is 5KΩ
Nominal Operating Level= +4dBu
NOTE: To avoid any degradation of the XRM’s channel signal, any processing gear patched into
the channel insert should have a low impedance output (<100Ω) and must be capable of cleanly
driving a 2KΩ load to +21dBu.
T= Send
R= Return
S= GND
Stereo input channel
2
p.18
XRM owner’s manual
500
2
3
2
3
0
500
2
3
2
3
2
3
2
3
2
3
2
3
2
3
2
3
2
3
2
3
2
3
2
Module
Block diagram
Controls
D
L
STR LINE IN
(
)
MIC PAD
35
GAIN
20
154060
SUM
INPUTS
0
+–
HF
88
1515
2K
3K
1K
5K
600
400
8K
0
HM
+–
88
1515
500
300
1K
100
2K
0
LM
+–
88
1515
0
+–
LF
88
1515
EQ
S1
ON
MIX SENDS
PRE
–
10
1
0
+
20
3
S
30
T
R
40
6
•
–
10
2
0
+
20
3
30
40
6
•
–
10
3
0
+
20
3
S
30
T
R
40
6
•
–
10
4
0
+
20
3
30
40
6
•
–
10
5
0
+
20
3
S
30
T
R
40
6
•
–
10
6
0
+
20
3
30
40
6
•
–
10
7
0
+
20
3
S
30
T
R
40
6
•
–
10
8
0
+
20
3
30
40
6
•
–
10
9
0
+
20
3
S
30
T
R
40
6
•
–
10
10
0
+
20
3
30
40
6
•
–
10
11
0
+
20
3
S
30
T
R
40
6
•
–
10
12
0
+
20
3
30
40
6
•
MUTE
S1
CHAN
LEVEL
–
10
0
+
20
5
30
40
10
•
PK
SIG
PFL
6
3
+48V ON
BAL XLR
IN
SPLIT
OUT
PIN 1 LIFT
BAL XLR
IN
SPLIT
OUT
BAL LINE IN
REAR PANEL
26dB
PA D
26dB
PA D
LEFT
RIGHT
LINE
(MIC PAD)
GAIN
15 - 60 dB
INPUT
PREAMP
SUM
MONO
PRE
EQ
PEAK
(PFL)
SIG
INPUT
SIGNAL
LED
R
G
STR LINE IN
(
MIC PAD
35
154060
SUM
INPUTS
0
400 - 8 KHZ80 - 2 KHZ80 HZ
400 - 8 KHZ80 - 2 KHZ80 HZ
OUT
L & R
GAIN
20
XRM STEREO INPUT MO
4 STEREO INPUTS AVAILABL
LEVEL
FREQ
LEVEL LEVELFREQ
LF LOW MID HI MID
FOUR BAND EQ - LEFT
LF LOW MID HI MID
FOUR BAND EQ - RIGHT
SOLO
TRIGGER
PRE-AMP
POST
FADER
L & R
PRE
FADER
L & R
)
LEFT
RIGHT
Front panel features
The XRM features four, full-function Stereo Input channels.These inputs are labeled S1 thru S4 and are located
directly left
of the master section. Each stereo channel features two mic preamps, so mic-level stereo sources
can be processed on one common channel. In cases where just a mono source is present, the SUM INPUTS
switch allows a mono source (plugged into either left or right input) to feed both sides of the stereo channel, effectively turning the stereo channel into an additional mono channel for the mixer.This SUM INPUTS
switch also permits the operator to collapse a stereo signal to mono if necessary.
The Stereo channels are very similar, front-panel wise, to the Mono channels. In most cases, the controls will
be identical and the descriptions are repeated here.Any Stereo-specific or Stereo-different controls will be
identified as such and further described.The rear panel differs in the amount of jacks offered per channel.
Because of space limitations, there is no Channel Insert jack available on the Stereo Channels.
Str Line In (Mic Pad)
With this switch in the UP position, the input preamp circuits are set up to accept mic-level
signals. These signals are brought in via the XLR mic-input connectors located on the rear panel.
The 1/4" TRS input jacks are ignored.
When the switch is depressed, a Pad is inserted into each of the signal paths and the input
preamp circuits are capable of accepting line-level signals from either the XLR mic-input connectors or the 1/4" TRS input jacks, located on the rear panel.The XLR signal is normal'd to the 1/4”
TRS jack. If nothing is plugged into the TRS jack, the XLR signal is fed to the preamp when the
LINE switch is pressed. Since the TRS signal is always padded down by 26dB, this feature allows
the LINE switch to act as a PAD switch for bringing a very hot microphone signals down to a
controllable level,avoiding overload.When a plug is inserted into a 1/4" TRS input jack, the XLR
mic-input signal is disconnected and the signal present on the 1/4” plug is fed to the preamp. If
plugs are inserted into both the XLR and TRS jacks, this switch acts as an input selector switch
between the two jacks.
Gain
The Input gain control is used to establish proper gain structure in the channel. For best
results, use the Solo system to monitor the channel while you set the gain.The goal is maximum
gain without distortion. Both the main LED meters (during Solo) and the channel’s Level/Peak
indicator can be used for adjusting gain.
SUM INPUTS (Stereo-specific)
By summing the inputs, a stereo input channel can be used as a mono input channel.
The channel functions as a stereo input; left input signals feed the left side of the Stereo
channel, right inputs feed the right side.
If signals are applied to both the Left and Right input jacks, they will be summed together as
a mono signal and fed to both sides of the Stereo channel.This sum-point is directly after the
input preamps. If a signal is applied to just one of the input jacks and this switch is pressed, that
lone signal will feed both sides of the channel and it will be treated as a mono signal throughout
the mixer.
Stereo Input channel
2
p.19
Stereo input channel
2
p.20
XRM owner’s manual
500500500500500500500500500500500500500 500
4
0
4
0
8
8
8
8
0
0
500
4
0
4
0
4
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4
0
4
0
4
0
4
0
4
0
4
0
4
0
4
0
2
500
0
500
Module
Block diagram
Controls
FADER
O
D
STR LINE IN
(
)
MIC PAD
35
GAIN
20
154060
SUM
INPUTS
0
+–
HF
88
1515
2K
3K
1K
5K
600
400
8K
0
HM
+–
88
1515
500
300
1K
100
2K
0
LM
+–
88
1515
0
+–
LF
88
1515
EQ
S1
ON
MIX SENDS
PRE
–
10
1
0
+
20
3
S
30
T
R
40
6
•
–
10
2
0
+
20
3
30
40
6
•
–
10
3
0
+
20
3
S
30
T
R
40
6
•
–
10
4
0
+
20
3
30
40
6
•
–
10
5
0
+
20
3
S
30
T
R
40
6
•
–
10
6
0
+
20
3
30
40
6
•
–
10
7
0
+
20
3
S
30
T
R
40
6
•
–
10
8
0
+
20
3
30
40
6
•
–
10
9
0
+
20
3
S
30
T
R
40
6
•
–
10
10
0
+
20
3
30
40
6
•
–
10
11
0
+
20
3
S
30
T
R
40
6
•
–
10
12
0
+
20
3
30
40
6
•
MUTE
S1
CHAN
LEVEL
–
10
0
+
20
5
30
40
10
•
PK
SIG
PFL
15 6 0
SUM
INPUTS
0
+–
0
500
0
0
ON
FA
8K
EQ
PRE
P
1515
1515
1515
1515
2K
3K
+–
1K
+–
+–
HF
5K
HM
LM
S1
6
3
LF
F
88
1
6
3
2
3
2
3
2
3
2
3
2
3
2
3
2
3
2
3
2
3
2
3
2
3
2
3
2
3
AIN
60 dB
SUM
MONO
PRE
EQ
FREQ LEVEL LEVELFREQ LEVEL
LEVEL
LF LOW MID HI MID HF
FOUR BAND EQ - LEFT
LF LOW MID HI MID HF
MUTE
EQ ON
CHAN
12 KHZ400 - 8 KHZ80 - 2 KHZ80 HZ
12 KHZ400 - 8 KHZ80 - 2 KHZ80 HZ
LEVEL
FOUR BAND EQ - RIGHT
2K
1K
600
400
88
300
100
88
F
88
MIX SENDS
FADER
AMPS
LEFT
+10
+10
RIGHT
PUT
AMP
YES
PRE
SOURCE
Front panel features
Stereo EQ
The Stereo Input channel has two parallel EQ circuits that are controlled by the same set of
knobs. It is functionally identical to the Mono Input EQ.
Many audio signals coming into the console require some degree of corrective eq in order to be
part of a good sounding mix. XRM offers a 4-Band EQ on each channel.The input EQ consists of
the bands: High, High-Mid, Low-Mid and Low.The High and Low frequency bands are shelving
equalizers, each have a boost/cut control and their frequencies are fixed.The High-Mid and LowMid bands have a bell-shaped response, each band features variable boost/cut and adjustable frequency.
high frequency—HF
Boost / Cut 15dB boost and cut. Shelving @ 12 kHz
high mid—HM
Frequency Continuously variable between 400 Hz and 8 kHz.
Boost / Cut 15dB boost and cut. Bell curve with a BW of approx 1.5 octaves
Low mid—LM
Frequency Continuously variable between 100 Hz and 2 kHz.
Boost / Cut 15dB boost and cut. Bell curve with a BW of approx 1.5 octaves
Low frequency—LF
Boost / Cut 15dB boost and cut. Shelving @ 80 Hz.
EQ on
Equalizer is OFF. The equalizer circuitry is bypassed.
Equalizer is ON. This switch is used to activate the EQ section and can be used to make
A/B comparisons between "flat" and eq'd signals.
Stereo Input channel
2
p.21
Stereo input channel
2
p.22
XRM owner’s manual
500500500500500500500500500500500500500 500
4
0
4
0
8
8
8
8
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0
500
4
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4
0
4
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500500500500500500500500500500500500500 500
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500
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3
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3
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3
0
Module
Block diagram
Master Faders Chan Level Chan Sends
STR LINE IN
(
)
MIC PAD
35
GAIN
20
154060
SUM
INPUTS
0
+–
HF
88
1515
2K
3K
1K
5K
600
400
8K
0
HM
+–
88
1515
500
300
1K
100
2K
0
LM
+–
88
1515
0
+–
LF
88
1515
EQ
S1
ON
MIX SENDS
PRE
–
10
1
0
+
20
3
S
30
T
R
40
6
•
–
10
2
0
+
20
3
30
40
6
•
–
10
3
0
+
20
3
S
30
T
R
40
6
•
–
10
4
0
+
20
3
30
40
6
•
–
10
5
0
+
20
3
S
30
T
R
40
6
•
–
10
6
0
+
20
3
30
40
6
•
–
10
7
0
+
20
3
S
30
T
R
40
6
•
–
10
8
0
+
20
3
30
40
6
•
–
10
9
0
+
20
3
S
30
T
R
40
6
•
–
10
10
0
+
20
3
30
40
6
•
–
10
11
0
+
20
3
S
30
T
R
40
6
•
–
10
12
0
+
20
3
30
40
6
•
MUTE
S1
CHAN
LEVEL
–
10
0
+
20
5
30
40
10
•
PK
SIG
PFL
1
6
3
2
3
2
3
2
3
2
T MODULE
3
VAILABLE
2
3
2
3
LEVEL LEVEL
2
3
2
ID HF
3
2
3
2
3
2
3
2
3
2
3
12 KHZ
KHZ
FT
ID HF
12 KHZ
KHZ
HT
FADER
LEFT
FADER
RIGHT
PRE
PRE
EQ
PRE
PRE
EQ
EQ ON
PRE-SOURCE
SELECT
YES
NO
CHAN
LEVEL
SOURCE
PRE
FADER
PRE
MUTE ?
PRE-SOURCE
BUFFERS
MUTE
FADER
AMPS
+10
+10
RIGHT
RIGHT
LEFT
PRE
FADER
LEFT
•
•
•
10
10
PK
SIG
6
–
0
6
MUTE
S1
CHAN
LE VEL
–
10
PFL
+
3
S
T
R
12
+
3
MIX SENDS
20
30
40
20
30
40
0
+
5
30
20
40
20
30
40
20
30
40
20
30
40
20
30
40
M1
30
20
40
M2
M3
M4
M5
M6
M7
M8
M9
M10
30
30
30
30
20
40
20
40
20
40
20
40
M11
M12
STR PAIR LO CUT STR PAIR LO CUT
M
1–23
M
LF
4
1
OUTPUT MASTERS
S
T
R
1
234
2
PEAK CIRCUIT
POST
FADER
MIX 1-4
PRE
SUM
20
–
4
10
5
0
5
10
20
30
30
30
40
20
40
20
30
40
PK
SIG
AFL
PFL
TO
MIX SENDS 1 & 2
MIX SENDS 3 & 4
MIX SENDS 5 & 6
MIX SENDS 7 & 8
MIX SENDS 9 & 10
MIX SENDS 11 & 12
SOLO LEFT
SOLO RIGHT
SOLO DC
LEV / LEV
__
LEV / PAN
SWITCHING
LEV / LEV
__
LEV / PAN
SWITCHING
LEV / LEV
__
LEV / PAN
SWITCHING
LEV / LEV
__
LEV / PAN
SWITCHING
LEV / LEV
__
LEV / PAN
SWITCHING
LEV / LEV
__
LEV / PAN
SWITCHING
EQ
S1
ON
PRE
–
10
•
10
•
10
•
10
•
10
•
10
•
10
•
10
•
10
•
10
•
10
•
10
•
1
0
+
3
S
T
R
6
–
2
0
+
3
6
–
3
0
+
3
S
T
R
6
–
4
0
+
3
6
–
5
0
+
3
S
T
R
6
–
6
0
+
3
6
–
7
0
+
3
S
T
R
6
–
8
0
+
3
6
–
9
0
+
3
S
T
R
6
–
10
0
+
3
6
–
11
0
+
3
S
T
R
6
–
12
0
+
3
6
MUTE
S1
CHAN
Mix Send features
The XRM is capable of generating 12 mono mixes, 6 stereo mixes, or a combination of both mono
and stereo mixes. Each of the six Odd/Even pairs of sends can be configured as a stereo pair- the
Odd pot becomes the level control, the Even pot becomes the pan pot.The changeover to stereo
operation is controlled by the STR PAIR switches located above the master faders.A LO CUT switch
is also present for activating the hi-pass filter (40Hz, -18dB/oct) for each pair of mixes.
NOTE: The Stereo Channels differ in how they feed the Mix Sends.With the Mono Channels, there
was only one source within the channel, so the feed to any Mix Send pot is always the mono source.
Switching to Stereo-Pair operation simply took this mono source and allowed it to be panned across
the odd and even buses. In the Stereo Channels, there are two signal sources, the left and right channel signals. Normally, a sum of these two signals is fed to the Mix Send pots; a pre-fader sum is also
generated for use with the Mix 1-4 PRE switch.When the corresponding STR PAIR switch is
depressed, the operation AND THE SOURCE of the Mix Sends change.The odd pot still becomes
the level control for both buses, but the even pot is now a BALance pot.The feed to the buses
changes from a summed mono feed to both sides, to a left-to-odd and right-to-even feed.The stereo
signal within the channel is maintained as it is fed to the stereo-paired mix buses. If the SUM INPUTS
switch is depressed, the stereo signals within the channel effectively become mono and the Mix sends
behave the same as on a Mono channel.
Mix 1 - 4 PRE
MIX Sends 1-4 are Post-Fader
MIX Sends 1-4 are Pre-Fader
Normally, the signal feeding the Mix Sends is derived after the main Chan Level Pot (Post-Fader).This
Chan Level pot controls the level of the chan signal feeding the individual Mix Send pots. Each Mix
Send pot is then used to generate a sub-mix of this channel signal.This Post-fader signal is also affected by the Mute switch; if the channel is muted, the Mix Send no longer receives a signal.There are
some cases where an independent mix is desired, the operator doesn’t want the Chan Level to affect
the signal. On the XRM, Mixes 1 thru 4 can be switched to receive their signal PRE the Chan Level
pot (Pre-fader).The default PRE setting for Mixes 1-4 is pre-fader, but it is still post-insert/postEQ/post Mute. An internal jumper (per channel) can be changed so that the PRE setting becomes
either pre-insert or pre-EQ.Another jumper allows this PRE setting to additionally be independent of
the channel mute.
Mix Sends 1 & 2
Levels for Mixes 1 and 2 are controlled by this pair of knobs. In MONO mode, each knob controls
the amount of chan signal that is sent to its corresponding mix bus. In Stereo Mode, the top knob
controls the level to both buses and the bottom knob acts as a Balance control between the two
buses- full CCW for Odd, full CW for Even.
STR PAIR sw in the UP position(located above Master Fader 1)
Knob 1: Send level for Mix 1
Knob 2: Send level for Mix 2
STR PAIR sw in the DOWN position
Knob 1: Send level for both Mix 1 and Mix 2
Knob 2: Balance control between Mix 1 and Mix 2
This Send arrangement is repeated for the remainder of the Mix Send pairs
on the channel. Each pair’s operation is controlled by its own STR PAIR
switch located above the corresponding odd-numbered Master Fader.
p.23
Stereo Input channel
2
Stereo input channel
2
p.24
XRM owner’s manual
500
3
3
6
3
500
3
3
3
3
3
3
3
3
3
3
3
6
•
Module
Block diagram
Controls
STR LINE IN
(
MIC PAD
35
GAIN
20
154060
SUM
INPUTS
0
+–
88
1515
2K
3K
1K
600
400
8K
0
+–
88
1515
500
300
1K
100
2K
0
+–
88
1515
0
+–
88
1515
EQ
ON
MIX SENDS
PRE
–
10
0
20
30
40
6
•
–
10
0
20
30
40
6
•
–
10
0
20
30
40
6
•
–
10
0
20
30
40
6
•
–
10
0
20
30
40
6
•
–
10
0
20
30
40
6
•
–
10
0
20
30
40
6
•
–
10
0
20
30
40
6
•
–
10
0
20
30
40
6
•
–
10
0
20
30
40
6
•
–
10
0
20
30
40
6
•
–
10
0
20
30
40
6
•
MUTE
S1
CHAN
LEVEL
–
10
0
20
30
40
10
•
PK
SIG
PFL
)
HF
5K
HM
LM
LF
S1
1
+
3
S
T
R
2
+
3
3
+
3
S
T
R
4
+
3
E
5
Q
+
3
S
T
R
6
+
3
7
+
3
S
T
R
8
+
3
9
+
3
S
T
R
10
+
3
11
+
3
S
T
R
12
+
3
+
5
PEAK
(PFL)
SIG
XRM STEREO INPUT MODULE
4 STEREO INPUTS AVAILABLE
LEVEL
FREQ
LEVEL LEVELFREQ LEVEL
LF LOW MID HI MID HF
FOUR BAND EQ - LEFT
LF LOW MID HI MID HF
FOUR BAND EQ - RIGHT
PRE
FADER
L & R
TRIGGER
POST
FADER
L & R
SOLO
PRE-AMP
INPUT
SIGNAL
LED
R
G
OUT
L & R
LEFT
RIGHT
12 KHZ400 - 8 KHZ80 - 2 KHZ80 HZ
12 KHZ400 - 8 KHZ80 - 2 KHZ80 HZ
PRE
FADER
PRE
EQ
PRE
FADER
PRE
EQ
EQ ON
PRE-SOURCE
SELECT
YES
NO
CHAN
LEVEL
PRE
FADER
PRE
SOURCE
MUTE ?
PRE-SOURCE
BUFFERS
MUTE
FADER
AMPS
+10
+10
RIGHT
LEFT
PRE
FADER
LEFT
RIGHT
POST
FADER
SUM
TO
PEAK CIRCUIT
MIX 1-4
PRE
PFL
MIX SENDS 1 & 2
MIX SENDS 3 & 4
MIX SENDS 5 & 6
MIX SENDS 7 & 8
MIX SENDS 9 & 10
MIX SENDS 11 & 12
20
30
40
SOLO LEFT
SOLO RIGHT
SOLO DC
LEV / LEV
__
LEV / PAN
SWITCHING
LEV / LEV
__
LEV / PAN
SWITCHING
LEV / LEV
__
LEV / PAN
SWITCHING
LEV / LEV
__
LEV / PAN
SWITCHING
LEV / LEV
__
LEV / PAN
SWITCHING
LEV / LEV
__
LEV / PAN
SWITCHING
MUTE
S1
CHAN
LE VEL
–
10
0
+
5
10
•
PK
SIG
PFL
M1
M2
M3
M4
M5
M6
M7
M8
M9
M10
M11
M12
Front panel features
Channel Level and Control
This next set of controls allows the operator to control and monitor the overall level of the channel
signal. Both sides of the Stereo channel (left & right) are simultaneously controlled.
Mute Sw and LED
The Mute switch kills the channel signals and prevents it from feeding any Mix Send pots.The muteelement itself is a FET transistor, allowing for timed, ramped on-off control of the channel signal.This
avoids any “pops and clicks” when muting a channel. Normally, the Mute will also affect the PRE signals
of the channel (see Mix Send details). PRE can be selected for Mix Sends 1 thru 4, and is normally the
Pre-fader channel signal.There are internal jumpers that allow the user to change the definition of this
PRE signal on a channel by channel basis, or it can be specified at the time of order and reconfigured
during the product build at the factory.The PRE signal can be changed from its normal Pre-Fader setting and redefined as either Pre-Insert or Pre-EQ.Additionally,the mute operation of the PRE signal
can be changed from its default of “Follow Chan Mute” to “Ignore Chan Mute”.Again, this chan by
chan option can be done either by the user or by the factory at the time of order.
Mute Switch UP, LED OFF
Channel is un-muted. Signal is allowed to pass (pre or post fader)to the Mix Send pots.
Mute Switch DOWN,LED ON
Channel is muted.The Post-Fader signals are prevented from reaching the Mix Send pots.The
PRE signals (available for Mix Sends 1-4) are also muted unless the option has been changed to
“Ignore Chan Mute”.
Channel Level Pot
This rotary pot controls the level of the Post-Fader signals sent to the individual Mix Sends. Mix Sends
5 thru 12 always receive this Post-Fader signal. Mix Sends 1 thru 4 have the option of selecting a Prefader signal by the use of the PRE button.
Continuously variable from OFF (full CCW) to +10dB gain (full CW).The panel is marked with
the dB level of the channel, 0dB (unity channel gain) is at approx the 2-o’clock position.
PeaK / SIGnal LED
This bi-color LED performs three functions:
1) Chan level; 2) Channel overload; 3) PFL status.
1) Varying intensity Green shows the L&R summed, pre-fader signal level
2) Red warns of channel clipping anywhere within the signal path. 6 points are monitored by the Peak
circuitry: Input preamps, EQ circuits, and Fader amps. If any of these points come within 3dB of clipping, the LED will illuminate Red.
3) If the Chan PFL button is depressed, the LED will illuminate Red.
PFL Sw (and LED)
The XRM is equipped with a Stereo Solo system. Input Channels are monitored Pre-Fader (PFL), and
outputs are monitored After-Fader (AFL).When a Stereo channel is Solo’d, it appears in the Solo
meters and headphone/monitor system as a stereo signal. If the SUM INPUTS sw is depressed, a
mono sum will be fed to the Solo system.The Solo’d signal is Pre-fader, the level feeding the Solo system is not affected by the setting of the Chan Lev pot.
Channel Pre-fader signal is sent to the Solo bus and displayed on the Solo meters and can be
heard on the Headphone and Monitor outputs.The chan PK/SIG LED will illuminate RED, indicating
that the PFL button is depressed.The Solo system is additive, so any and all channels that have their
PFL switches depressed will be mixed together and monitored by the Solo system.
p.25
Stereo Input channel
2
LED
p.26
Stereo input channel
2
XRM owner’s manual
+
X
n
Rear panel
Block diagram
Connectors
+48V
Balanced Line Inputs
For Stereo Channels S1–S4
L
Bal
Input
L
Bal
Input
S4S3S2
On
PUSH
L
L
Input
Bal
Input
PUSH
R
R
S1
XLRs
Pin1 Lift
L
L
Bal
Split Out
Input
R
R
+48V ON
BAL XLR
IN
SPLIT
OUT
+48V
On
S4
PUSH
L
Input
R
PUSH
XLRs
Pin1 Lift
L
Split Out
R
On
On
S2
S3
PUSH
PUSH
L
L
Input
Input
R
R
PUSH
XLRs
XLRs
Pin1 Lift
Pin1 Lift
L
L
Split Out
Split Out
R
R
S1S2S3S4
+48V
+48V
+48V
+48V
On
On
S1
Balanced Line In
Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In
1112
Balanced
Input
R
XLRs
XLRs
Pin1 Lift
Pin1 Lift
Split Out
Split Out
R
Chan
11
12
Insert
+48V
+48V
On
On
9
10
Balanced
Balanced
Input
Input
XLRs
XLRs
Pin1 Lift
Pin1 Lift
Split Out
Split Out
Chan
Chan
9
10
Insert
Insert
Balanced
Input
Pin1 Lift
Chan
Insert
+48V
+48V
On
On
7
8
Balanced
Input
XLRs
XLRs
Pin1 Lift
Split Out
Split Out
Chan
7
8
Insert
LINE
(MIC PAD)
Balanced
Chan
Insert
Input
+48V
On
6
Balanced
Input
XLRs
Pin1 Lift
Split Out
Chan
6
Insert
+48V
On
5
XLRs
Pin1 Lift
Split Out
5
GAIN
15 - 60 dB
+48V
+48V
On
On
3
4
Balanced
Balanced
Input
Input
XLRs
XLRs
Pin1 Lift
Pin1 Lift
Split Out
Split Out
Chan
Chan
3
4
Insert
Insert
LEFT
+48V
2
Balanced
Input
XLRs
Pin1 Lift
Split Out
Chan
2
Insert
SUM
MONO
+48V
On
On
Balanced Line Inputs
1
Balanced
Balanced
Input
Input
PUSHPUSHPUSHPUSHPUSHPUSHPUSHPUSHPUSHPUSHPUSHPUSHPUSH
XLRs
Pin1 Lift
Split Out
Chan
Chan
1
Insert
Insert
For Stereo Channels S1–S4
L
Bal
Input
R
S3
S4
L
Bal
Input
S1
R
S2
L
Bal
Input
R
L
Bal
Input
R
+48V
On
PUSH
L
Input
PUSH
XLRs
Pin1 Lift
L
Split Out
S4
L
R
Pi
L
R
S3S4
PIN 1 LIFT
BAL XLR
IN
SPLIT
OUT
BAL LINE IN
REAR PANEL
RIGHT
INPUT
PREAMP
26dB
PA D
26dB
PA D
p.27
Stereo Input channel
2
Rear panel features
+48 V On
+48 volts DC is applied equally (thru current-limiting resistors) to both pins 2 and 3 on both
the L & R mic-input XLR connectors.This feature is used with condenser microphones and active
direct boxes that require an external DC voltage (phantom power) in order to operate. For dynamic
or ribbon mics, phantom voltage is not required and should be switched OFF.
NOTE: See the Mono Channel Rear Panel description for warnings and limitations when operating
the phantom power switch.
Line Input jack
Line-level signals, balanced or unbalanced, may be brought into the input channel through these
1/4” TRS jacks.The LINE switch (front panel) must be pressed for this jack to be active. On the XRM,
the XLR jacks are normal'd to the switching contacts of these jacks. If nothing is plugged into the jack,
a padded XLR signal is available to the channel when the LINE switch is depressed.This allows the
LINE switch to perform a dual function: XLR pad if nothing is plugged into the Line jack, or
XLR(Mic)/Line input selection if the jack is being used.
Tip is Positive Input, Ring is Negative Input, Sleeve is Chassis Ground
Input impedance is 20KΩ balanced.
XLR(Mic) Input jack
This balanced, latching, female XLR accepts a low-impedance microphone signal, or a line-level
signal, depending on the position of the LINE INPUT switch on the front panel.
Pin-2 is Positive Input, Pin-3 is Negative Input, Pin-1 is Chassis Ground
Input impedance is 4KΩ balanced
Pin-1 Lift Switch
Pin-1 of all four of the XLR jacks is connected to the XRM chassis thru this switch.
This Pin-1 connection serves two main functions:
1) A shield connection point that allows interference signals (picked up by the cable shield) to be
effectively shunted to ground, thus avoiding signal degradation.
2) A DC return path for the +48 volt phantom power voltage.
Normally, this switch is left in the UP position; Pin-1 is tied to the XRM chassis, and the shielding and
phantom power functions are both maintained.When the XRM is used by itself, there is usually no
reason to press this switch.When the XRM is used in conjunction with another mixer, either by using
the built-in passive splitter, or when fed from an external splitter, there may be situations where
ground differences between mixers can cause a “ground-loop”.This usually manifests itself as a lowfreq hum (usually at the AC mains freq), a hi-freq buzz, or a combination of both. In most cases, lifting
the ground connection between mixers can clean up this interference.
Pin-1 of ALL XLR jacks is connected to Chassis ground.
Pin-1 of ALL XLR jacks is disconnected from Chassis ground.
NOTE 1: The pin-to-pin wiring between the paired XLR connectors is never changed by this switch,
it only disconnects the common, Pin-1 of the XLRs from the mixer chassis, never from one another.
NOTE 2: Remember- if this switch is depressed, it prevents the XRM phantom power from reaching
the attached microphones. Phantom power (if needed) must be supplied from an alternate source. an
alternate source.
Split-Out XLR jack
This male XLR jack is wired pin-to-pin to its corresponding female XLR input jack.In combination with the female XLR, it forms a passive,Y-Split of the input signal.This split-signal can be used to
feed the mic input to another mixer (usually the FOH mixer), or to “mult” the input to another channel on the XRM.
NOTE: This pin-to-pin connection between paired XLR jacks is NOT affected by the Pin-1 lift switch.
Master section
3
p.28
XRM owner’s manual
Module
Block diagram
Controls
P
H
O
1R
N
E
S
LEV
6
4
357
28
1
9
0
10
SPEAKERS
ON
LEV
6
4
357
28
COMMON INPUT
STR PAIR LO CUT STR PAIR LO CUT
STR PAIR LO CUT STR PAIR LO CUT
STR PAIR LO CUT STR PAIR LO CUT
LR
1
9
0
10
SOLO
1–23
10
5
0
5
10
20
30
OUTPUT MASTERS
PK
SIG
1
234
AFL
5–67
XR
10
5
0
5
10
20
30
OUTPUT MASTERS
PK
SIG
5
678
AFL
9–10 11–12
10
5
0
5
10
20
30
OUTPUT MASTERS
PK
SIG
9
10 11 12
AFL
12V
P
LAMP
9
6
3
0
3
6
9
12
15
18
21
24
PWR
–
4
H
)
O
N
E
S
5
LEV
6
4
3
7
28
1
3
0
SPEAKERS
5
4
10
6
9
ON
LEV
7
28
1
COMMON INPUT
9
0
10
1R
LR
SOLO
12
15
18
21
24
9
6
3
0
3
6
9
12V
LAMP
PWR
–
8
SOLO
SOLO LEFT
SOLO RIGHT
SOLO DC
ODD
MIX BUSES
1
3
5
7
9
11
2
4
6
8
10
12
EVEN
MIX BUSES
MIX AMPS
SOLO
CONTROL
LOGIC
SOLO
FEED
L - R
L
R
LED
METERS
FOLLOW SOLO
COMMON
INPUT
LEVEL
SOLO AND MONITOR CIRCUITS
+9
6
3
0
-3
6
9
12
15
18
21
24
SOLOONPWR
ON
MONITOR / HP
LEVEL
L
R
COMMON INPUT CIRCUITRY
SPEAKER
ON
HEADPHONE
AMP
HEADPHONE
JACK
MONITOR
OUT - L
MONITOR
OUT - R
COMMON
INPUT - L
COMMON
INPUT - R
Front panel features
The XRM master section contains the controls and indicators for the Solo system, headphone and Monitor
system, and Mix Master outputs.This section allows the operator to control the overall operation of the mixer.
A BNC lamp connector, supplied with +12 volts,is also located within this section. Each individual sub-system
will be described in detail.
Solo System
The XRM is equipped with a Stereo Solo System. Input channels (Mono or Stereo) are monitored
Pre-Fader (PFL), and Outputs are monitored After-Fader (AFL). Even though the Solo System itself is
stereo, not all monitored points are stereo sources. In those cases, the source appears in the Solo
System as a mono signal and appears equally on both meters and is present on both sides (L & R) of
the headphone and Monitor outputs.
Mono sources include:
A) Mono Input channels 1 thru 12,
B) Mix Outputs 1 thru 12 : IF the corresponding STR PAIR switch is NOT depressed.
Stereo sources include:
A) Stereo Input channels S1 thru S4 (NOTE:The PFL monitoring point is after the SUM INPUTS
switch, so a Stereo channel will solo as mono (it really is) if the switch is depressed.
B) Mix Output Pairs 1-2 thru 11-12 : IF the corresponding STR PAIR switch IS depressed. Either AFL
switch (odd or even) will trigger the Solo system, and both LED indicators will show Red.
The Solo System is additive.ANY and ALL sources that have their corresponding solo switches
pressed (PFL or AFL) will be mixed together.The resulting mixed signal will be displayed on the
meters and heard in the phones and monitor system.
Headphone jack (PHONES)
This 1/4” TRS jack is intended for use with stereo headphones.Any signals that are present in
the Solo System can be monitored here.When nothing is solo’d, the output is off. Although capable of
driving low impedance headphones ( 8Ω), best results (maximum output) are obtained with medium
impedance phones (30Ω to 75Ω types).
Headphone/Monitor Level Control
This knob controls the amount of Solo audio fed to the Headphones and also to the rear-panel
Monitor Out jacks. If no Solo is active, both outputs are OFF (no signal). In most cases, the operator
will use headphones to monitor the signals within the XRM, however, there are certain situations
where additional monitoring is needed.A cue wedge may need to be set up, or the solo audio may
need to be fed to a remote monitoring location; the Monitor Out jacks are available for this purpose.
SPEAKERS ON
This switch activates the rear-panel Monitor Out jacks..
Monitor Out jacks are muted (OFF).
Solo audio (controlled by the above Level control) can feed the Monitor Out jacks.
SOLO Meters (L & R)
These 12-segment LED ladders show the audio level of the Solo system.When nothing is being solo’d,
the meters are off.The meters have a “VU Type” response, they smooth-out the signal and display an
average of the audio level.
SOLO (ON)
This Red LED will illuminate when any solo switch is depressed.
PWR
This Green LED illuminates when the XRM is powered on.
Master section
3
p.29
Master section
3
p.30
XRM owner’s manual
Block diagram- Common Input
Module
Block diagram- Mix Outputs
9
6
3
0
3
6
9
12
15
18
21
24
LR
SOLO
PWR
–
10
5
0
5
10
20
30
12V
LAMP
4
P
H
O
N
E
S
STR PAIR LO CUT STR PAIR LO CUT
1R
LEV
6
4
357
28
1
9
0
10
SPEAKERS
ON
LEV
6
4
357
28
1
9
0
10
COMMON INPUT
1–23
ODD
MIX BUSES
1
3
5
7
9
11
2
4
6
8
10
12
EVEN
MIX BUSES
COMMON
INPUT
LEVEL
L
R
COMMON INPUT CIRCUITRY
COMMON
INPUT - L
COMMON
INPUT - R
OUTPUT MASTERS
PK
SIG
1
234
AFL
STR PAIR LO CUT STR PAIR LO CUT
5–67
XR
–
8
10
5
0
5
10
20
30
OUTPUT MASTERS
PK
SIG
5
678
AFL
STR PAIR LO CUT STR PAIR LO CUT
9–10 11–12
AIN
BON
BLE
-
WAY
CTRL TO
INPUT SENDS
STEREO PAIR
SOLO LEFT
SOLO RIGHT
SOLO DC
ODD
MIX AMP
AFFECTS BOTH
ODD & EVEN
STEREO
PAI R
SOLO
LOGIC
SWITCH
EVEN
MIX AMP
XRM MIX PAIR
1 OF 6 PAIRS SHOWN
HPF
40Hz
-18dB/Oct
HPF
LO-CUT
ON
&
-18dB/Oct
HPF
HPF
40Hz
AFL-ODD
AFL-EVEN
PEAK
(AFL)
SIG
PEAK
(AFL)
SIG
SIG/PK
LED
R
G
SIG/PK
LED
R
G
PRE
FADER
ODD
FADER
60MM
PRE
FADER
EVEN
FADER
60MM
POST
+10
+10
FADER
POST
FADER
ODD MIX
BUS IN
MIX INSERT
SEND / RTN
ODD MIX
BAL OUT
EVEN MIX
BUS IN
MIX INSERT
SEND / RTN
EVEN MIX
BAL OUT
Front panel features (continued)
Common Input
Often, a click track, tape playback or ref track, needs to be heard by all the performers.An input channel can be used for this, with all mix sends turned up to the same level. If an input channel is not available, the Common Input section can be used for that purpose. Input jacks,both TRS and XLR, are provided on the rear panel for bringing a line-level, stereo feed into the mixer.This signal is fed to the level
pot and then to the Mix buses, left-side signal to odd buses, right-side signal to even buses.
Common Input Level
This pot controls the amount of Common Input signal fed to the Mix buses. Left input feeds the
odd buses, right input feeds the even buses.
12 V Lamp jack
A BNC jack is available for attaching a goose-neck lamp.The center connection is 12 Volts DC and the
outer connection is ground. A medium or high-intensity 12V DC Littlite can be used.The output voltage is current limited to prevent faulty bulbs or mis-connection from harming the internal workings of
the mixer.
Mix Master Outputs
Each of the 12 Mix Outputs has its own 60mm master fader, AFL switch, and Peak/Sig LED.
Additionally, each odd-even pair of outputs has an associated STR PAIR switch and LO CUT
switch. Both of these switches affect both of the outputs of the pair: The STR PAIR switch
changes the pair of outputs from independent mono to linked-stereo.The LO CUT switch
activates the hi-pass filters on both outputs (40Hz, -18dB/Oct)
When operating the mixes as separate Mono outputs, each fader sets the overall output level
and the associated AFL switch below the fader allows the operator to monitor the output
level of the mix.
When it is desired to operate in Stereo-Pair Mode, the STR PAIR switch located above the
odd-numbered fader is pressed.This sends a control signal to the input channels which reconfigures the associated pair of send pots from Level/Level operation to Level/Pan operation.
Additionally, the AFL switches for the pair of outputs are linked and the Solo feed is changed
from mono to stereo. Now, if either AFL switch of the pair is pressed, both AFL indicators will
illuminate Red and both outputs will appear in the Solo system, odd to left, even to right.
STR PAIR switch
The pair of outputs associated with this switch are un-linked and operate as independent mono
mixes.The AFL switch for the fader will produce a mono feed to the Solo system.
The pair of outputs are linked:The associated mix sends on the input channels are changed to
Lev/Pan operation, and the AFL switches for the two outputs are linked, producing a stereo Solo feed
of the outputs if either AFL is pressed.
LO CUT switch
Both outputs operate at full bandwidth, low frequencies are not attenuated.
Hi-pass filters are inserted into the signal paths of both outputs, reducing low frequency rumble.
Master section
3
p.31
Master section
3
p.32
XRM owner’s manual
SOLO
PWR
COMMON INPUT
Module
Block diagram
Controls
P
H
O
N
E
S
28
28
COMMON INPUT
STR PAIR LO CUT STR PAIR LO CUT
STR PAIR LO CUT STR PAIR LO CUT
STR PAIR LO CUT STR PAIR LO CUT
12V
1R
LAMP
LEV
6
4
357
1
0
4
357
1
0
1
5
9
9
6
3
9
0
10
3
6
SPEAKERS
9
ON
12
15
LEV
6
18
21
24
LR
9
10
SOLO
PWR
1–23
OUTPUT MASTERS
5–67
XR
OUTPUT MASTERS
9–10 11–12
OUTPUT MASTERS
–
4
10
5
0
5
10
20
30
PK
SIG
234
AFL
–
8
10
5
0
5
10
20
30
PK
SIG
678
AFL
10
5
0
5
10
20
30
PK
SIG
10 11 12
AFL
AIN
BBON
BLE
-
WAY
CTRL TO
INPUT SENDS
STEREO PAIR
SOLO LEFT
SOLO RIGHT
SOLO DC
ODD
MIX AMP
AFFECTS BOTH
ODD & EVEN
STEREO
PAI R
SOLO
LOGIC
SWITCH
EVEN
MIX AMP
STR PAIR LO CUT STR PAIR LO CUT
1–23
10
10
20
30
OUTPUT MASTERS
PK
1
XRM MIX PAIR
1 OF 6 PAIRS SHOWN
HPF
40Hz
-18dB/Oct
HPF
PRE
FADER
LO-CUT
ON
AFL-ODD
PEAK
(AFL)
SIG
SIG/PK
LED
R
G
ODD
FADER
60MM
+10
&
AFL-EVEN
HPF
HPF
40Hz
-18dB/Oct
PEAK
(AFL)
SIG
SIG/PK
LED
R
G
PRE
FADER
EVEN
FADER
60MM
+10
SIG
234
AFL
POST
FADER
POST
FADER
–
4
5
0
5
ODD MIX
BUS IN
MIX INSERT
SEND / RTN
ODD MIX
BAL OUT
EVEN MIX
BUS IN
MIX INSERT
SEND / RTN
EVEN MIX
BAL OUT
Front panel features (continued)
Master Fader - Mix Output Level
Each of the twelve mixes has its own 60mm master fader.This fader controls the main
output of the mix and allows the operator to easily adjust the level sent to the performers. Up to 10dB additional gain is available.The faders are arranged in odd/even pairs for
ease of use when operating in Stereo mode. Nominal setting is at the 0 (unity) point.
Peak/Signal LED + AFL Switch & indicator
PK/SIG This bi-color LED indicates the pre-fader mix level with varying intensity Green
illumination. If critical internal signals get to within 3dB of clipping, the LED will turn Red.This
LED will also indicate AFL activation by turning Red.
AFL This switch allows the engineer to monitor the post-fader level of the mix.
Pressing the switch will turn the PK/SIG LED Red and feed the mix to the Solo system where
it can be viewed (Solo meters) and monitored (HP and Monitor Out) by the operator. In
Mono mode, only the associated mix is fed to the Solo system. It appears as a mono signal in
the Solo system (equal level in both left & right). If the associated STR PAIR switch is
depressed (located above the odd-numbered faders), then pressing EITHER the odd or even
AFL switch will cause BOTH LEDs to illuminate and both mixes will be fed to the Solo system
as a stereo pair, odd mix to left, even mix to right.
Repeat as necessary:
The previous descriptions of the functions associated with each of the Master faders are
repeated for the remaining Master faders.The stereo pairing, when activated by a STR
PAIR switch, always operates between the associated mixes 1-2, 3-4, 5-6, 7-8, 9-10 and 11-
12. Not only are the output faders and their controls affected by this switch, the associated mix sends on all the input channels are also affected.The Sends are reconfigured from
their normal Lev/Lev operation (odd-pots feed odd buses, even-pots feed even buses) to
the Lev/Pan stereo configuration (odd-pots feed BOTH odd and even buses, even-pots
pan between the buses).
Master section
3
p.33
10
5
0
5
10
15
20
30
LED
Master section
3
p.34
XRM owner’s manual
Bus Inputs
Block diagram
Mix Inserts and Outputs
Bus Input to Mixes
9
3
Mix Insert
1
Mix Insert
5
1
Mix Insert
11
Mix Insert
9
Mix Insert
7
Mix Insert
5
10
11
12
MAIN
RIBBON
CABLE
-
40 WAY
INPUT SENDS
STEREO PAIR
SOLO RIGHT
CTRL TO
SOLO LEFT
SOLO DC
6
7
8
ODD
MIX AMP
AFFECTS BOTH
ODD & EVEN
STEREO
PAI R
SOLO
LOGIC
SWITCH
2
Mix Out
1
2
Mix Out
4
3
4
ODD MIX
MIX INSERT
SEND / RTN
ODD MIX
BAL OUT
EVEN MIX
BUS IN
BUS IN
6
Mix Out
5
6
POST
Mix Out
10
9
10
PRE
FADER
ODD
FADER
60MM
2
12
Mix Out
3
4
HPF
40Hz
-18dB/Oct
HPF
LO-CUT
ON
&
AFL-ODD
PEAK
(AFL)
SIG
11
12
XRM MIX PAIR
1 OF 6 PAIRS SHOWN
SIG/PK
LED
R
G
Mix Out
+10
8
7
8
FADER
EVEN
MIX AMP
HPF
HPF
40Hz
-18dB/Oct
AFL-EVEN
PEAK
(AFL)
SIG
SIG/PK
LED
R
G
PRE
FADER
EVEN
FADER
60MM
+10
POST
FADER
MIX INSERT
SEND / RTN
EVEN MIX
BAL OUT
Rear panel features
Main Outputs 1 thru 12
The XRM has 12 Mix outputs. Each output features the following connectors:
Bus Input
Mix Insert
Main Out
Bus Input
Each of the 12 mixes has an associated Bus Input jack.This female XLR allows external signals
to be mixed into the XRM, either from another X-Rack mixer, or any other audio source.
Electronically balanced input: 20KΩ impedance
Pin-2 Hot, Pin-3 Cold, Pin-1 Chassis
Nominal input level is +4dBu
Mix Insert
This switching 1/4” TRS jack allows an external processor to be inserted into the signal
path of the mix bus.The tip carries the SEND signal from the XRM, and the ring carries the RETURN
signal back to the XRM.The insert-send point is located directly after the Lo-Cut filter on the output,
the return comes back at the top of the master fader.
Tip is Send, Ring is Return, Sleeve is Audio Ground.
Send (output) impedance is 100Ω unbalanced
Return (input) impedance is 5KΩ unbalanced
Nominal Operating Level= -2dBu
NOTE: To avoid any degradation of the XRM’s output signal, any processing gear patched into the
mix insert should have a low impedance output (<100Ω) and must be capable of cleanly driving a
2KΩ load to +21dBu.
Mix Output
This male XLR is the main output feed for each of the 12 mixes.The jacks are physically
arranged for ease of identification when wiring stereo pairs.The output can be used either balanced
or unbalanced. For unbalanced operation, connect Pin-3 to Pin-1 and take the output from Pin-2.
Electronic balanced cross-coupled output: 100Ω impedance (50Ω per leg)
Pin-2= Hot, Pin-3= Cold, Pin-1= Chassis
Nominal output level is +4dBu.
Master section
3
p.35
T= Send
R= Return
S= GND
p.36
Master section
3
XRM owner’s manual
Rear panel
Block diagram
Common Input to All Mixes
( Level Control on Front Panel )
SOLO
MIX AMPS
SOLO LEFT
SOLO RIGHT
SOLO
SOLO DC
CONTROL
LOGIC
SOLO
FEED
Left
(Odd)
Left
(Odd)
Monitor
Out
Controlled
by
SPEAKER- ON
Switch
Right
(Even)
Right
(Even)
SOLO AND MONITOR CIRCUITS
+9
6
3
LED
METERS
FOLLOW SOLO
L - R
0
-3
6
9
12
15
18
21
24
SOLOONPWR
ON
MONITOR / HP
L
R
LEVEL
SPEAKER
ON
HEADPHONE
AMP
HEADPHONE
JACK
MONITOR
OUT - L
MONITOR
OUT - R
ODD
MIX BUSES
1
3
5
7
9
11
2
4
6
8
10
12
EVEN
MIX BUSES
COMMON INPUT CIRCUITRY
COMMON
COMMON
INPUT
LEVEL
L
R
INPUT - L
COMMON
INPUT - R
p.37
Master section
3
Rear panel features (continued)
Other Inputs and Outputs
Common Input
A stereo input is provided for feeding a common signal to all of the 12 mix buses simultaneously. From the stereo source, the left signal will feed all of the odd mixes, the right signal will
feed all of the even mixes. Both XLR and 1/4” TRS jacks are provided, the XLR jack is normal'd
thru the TRS jack, so if a plug is inserted into the TRS jack,the XLR is disconnected.
Electronically balanced input: 20KΩ impedance
XLR: Pin-2= Hot, Pin-3= Cold, Pin-1= Chassis
XLR is normal'd to TRS jack (see diagram):
TRS: Tip= Hot, Ring= Cold, Sleeve= Chassis
Nominal input level is +4dBu
Monitor Output
This output follows the Solo system and is controlled by both the HP/Mntr pot and SPEAKER
ON switch on the front panel.The pot controls the audio level of both the front panel
PHONES jack, and also these rear panel Monitor Out jacks.The SPEAKER ON switch enables
these rear jacks while leaving the PHONES unaffected.These jacks normally would feed the
engineer’s monitor system if something more than headphone listening was desired. Both TRS
and XLR jacks are provided, they are wired in parallel, and both sets may be used
Electronic balanced cross-coupled output: 100Ω impedance (50Ω per leg)
XLR: Pin-2= Hot, Pin-3= Cold, Pin-1= Chassis
TRS: Tip= Hot, Ring= Cold, Sleeve= Chassis
Nominal output level is +4dBu.
p.38
Master section
3
XRM owner’s manual
AC Inlet
Information and warnings
Solo Link Connectors
Tie Mixers together
Connector Pinouts,
Levels & Impedance
User Options
SOLO
LINK
IN OUT
Use 5-Pin DIN cable to interconnect
SOLO Systems of X-Rack Mixers
I/O Connections • Operating Levels • Impedance (Ω)
–
60dBu
+
4dBu
+
4dBu
+
4dBu
20K
20K
20K
+
–
Bal In (Mic)
Bal In (Line)
Bus In
Common In
2
2= IN
3
3= IN
1= CHS
1
• XLR Female •
4K
Professional Audio Products
Designed and Built in the USA
Crest Audio Inc.
Fair Lawn, NJ 07410 USA
www.crestaudio.com
CAUTION
RISK OF ELECTRIC SHOCK
AVIS : RISQUE DE CHOC ÉLECTRIQUE—NE PAS OUVRIR
WARNING: TO REDUCE THE RISK OF FIRE OR
ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT
ATTENTION! POUR ÉVITER LE RISQUE D'INCENDIE
OU DE CHOC ÉLECTRIQUE, NE PLACEZ PAS CET APPAREIL
INSTALLER SUR SUPPORT DE MONTAGE SEULEMENT
NO USER SERVICEABLE PARTS INSIDE. REFER
SERVICING TO QUALIFIED SERVICE PERSONNEL
DO NOT OPEN
TO RAIN OR MOISTURE
SOUS LA PLUIE OU Á L'HUMIDITÉ
MOUNT IN RACK ONLY
X-RACK
RACK-MOUNT MIXER
0
AC IN
100-240V
50 / 60 Hz
80W
COMMERCIAL
U
CUS
®
LISTED
AUDIO
L
SYSTEM
25E9
ON
P
O
W
E
R
12
3
XLR Input
1
2
3
3
12
Passive
Split Out
1= CHS
2= OUT
3= OUT
Split Out
+
Mix Out
–
Monitor Out
• XLR Male •
+
T= IN
R= IN
S= CHS
–
Line Input
Common In
• 1/4” TRS Input •
+
T= OUT
R= OUT
S= CHS
Monitor Out
–
• 1/4” TRS Output •
T= Send
R= Rtn
S= GND
Chan Insert
Mix Insert
• 1/4” TRS Insert •
Press For
Pin 1 Lift
When Lift-Switch Is
Pressed, Pin1 Of BOTH
XLRs Is Disconnected
From Mixer Chassis
NOTE: Lifting Pin 1 will
disable Phantom Power
• Pin 1 Lift Operation •
Passive
+
4dBu
+
4dBu
+
4dBu
+
4dBu
+
4dBu
+
4dBu
-2dBu
X-Rack
Chassis
Connection
100
100
20K
20K
100
Send=
100
Rtn=
10K
X-Rack
Preamp
4K
XRM
• DEFAULT CHANNEL SETTINGS •
• Mix Sends Are Post-Fader/Follow Mute
• When “PRE” Button Is Pressed, Mix
Sends Change To Pre-Fader(Post-EQ
• OPTIONS FITTED
When “PRE” Button Is Pressed,
Mix Sends Change To:
PRE-INSERT PRE-EQ
YES PRE FOLLOWS MUTE ? NO
(Marked By ✘)
)
•
p.39
Master section
3
Rear panel features (continued)
Solo Link
When using multiple X-Rack mixers together, the solo systems can be linked.This Solo Link is
compatible with the XR-20 and XR-24 Rack mixers.A 5-pin, shielded DIN cable, wired pin-topin, can be used to link the Solo Audio and control signals between mixers.The “Slave” mixer
has its own solo’d signals appear in its own solo system, but these signals are also passed to
the “Master” mixer where they also show up in the Master mixer solo system, added to any
existing solo’d signals, or triggering the Master solo if nothing else was present.The Master and
Slave consoles are designated by the IN-to-OUT relationship between the Solo Link connectors.The Master mixer should have the DIN cable plugged into the IN jack, the other end of
the cable should plug into the Slave’s OUT jack.
This linking can extend to additional mixers (no practical limit). Just keep plugging additional
DIN cables between the added mixers.The daisy-chain continues, the ultimate Master will be
the mixer with only one DIN cable plugged into the Link-IN jack.
NOTE 1:You should not plug the ends of the link-cable into both Link-IN jacks or both LinkOUT jacks across two mixers. No permanent damage will result, but there may be erratic solo
behavior (besides, it’s not a nice thing to do to the XRM).
NOTE 2: Even though the DIN connector is the same type as used in MIDI systems, the Link
connection is not MIDI and should not be connected to a MIDI device.
Audio Linking
The XRM is equipped with bus-in jacks on all the main mix buses (see earlier Rear-Panel detail) allowing the user to create a larger console out of multiple XRM, XR-20/24 or combinations of all types.
Similar to the Solo-Link description,“Slave” mixers can be fed to “Master” mixers by using standard,
shielded XLR cables to tie the Slave balanced outputs to the Master mixer’s bus inputs.The Slave outputs (still controlled by their our master faders) are fed to the Master mixer as a sub-mix. No additional inputs are taken up, the bus inputs allow for easy expansion.
AC Input
The XRM uses an internal switching power supply which is capable of accepting a wide range of line
voltages.This industry-standard IEC connector will mate up with any of the common IEC line cords.
The incoming voltage can be anywhere between 100 and 240 volts, +/- 10%.The AC mains frequency
can be 50 Hz or 60 Hz.
Connector Pinout detail
The rear panel of the XRM is screened with the pinout and electrical details of the I/O connectors. It
is reprinted here for your reference.
XRM Internal Options
The Input Channels have various options that can be selected. If specified at time of order, the factory
will set-up the XRM with the user’s desired settings. If configured from the factory, the appropriate
check-box will be marked, showing which option was changed, and what it was changed to.
Mix 1-4 PRE: This PRE source is normally Pre-fader. It can be changed to Pre-Insert or Pre-EQ
PRE-Follow Mute: Normally,the PRE signal (no matter what the source) will be muted when the
main channel is muted (MUTE sw depressed).An option allows the PRE source to ignore the channel
mute and be active (ON) at all times.
p.40
I/O Connections • Operating Levels • Impedance (Ω)
–
60dBu
+
4dBu
+
4dBu
+
4dBu
+
–
Bal In (Mic)
Bal In (Line)
Bus In
Common In
2
2= IN
3
3= IN
1= CHS
1
4K
20K
20K
20K
• XLR Female •
12
3
XLR Input
1
2
3
3
12
Passive
Split Out
1= CHS
2= OUT
3= OUT
Split Out
+
Mix Out
–
Monitor Out
• XLR Male •
+
T= IN
R= IN
S= CHS
–
Line Input
Common In
• 1/4” TRS Input •
+
T= OUT
R= OUT
S= CHS
Monitor Out
–
• 1/4” TRS Output •
T= Send
R= Rtn
S= GND
Chan Insert
Mix Insert
• 1/4” TRS Insert •
Press For
Pin 1 Lift
When Lift-Switch Is
Pressed, Pin1 Of BOTH
XLRs Is Disconnected
From Mixer Chassis
NOTE: Lifting Pin 1 will
disable Phantom Power
• Pin 1 Lift Operation •
Passive
+
4dBu
+
4dBu
+
4dBu
+
4dBu
+
4dBu
+
4dBu
-2dBu
X-Rack
Chassis
Connection
100
100
20K
20K
100
Send=
100
Rtn=
10K
X-Rack
Preamp
4K
p.41
Specifications
4
Specifications
Frequency response +0/-0.5dB 20Hz-20kHz ref 1kHz
(any input to any output)
THD+noise any output <0.01% THD 20Hz-20kHz@ +15dBu out
Noise mic ein: better than –128dBu 20Hz to 20kHz 150 ohm source, 60dB gain
Bus Noise: better than -85dBu
Crosstalk/Shutoff All Crosstalk measurements: 20Hz to 20kHz BW
Channel Mute >90dB
Channel Fader attenuation >90dB
Mix Send attenuation >85dB
Phase Shift < +/- 30 degrees, 20Hz to 20kHz – mic-in to mix out
XLR In F-XLR 4k ohm balanced
max voltage gain to mix outs = 92dB
Split Out M-
XLR 4k ohm balanced
Passive “Y-Split” of XLR In
Line-in TRS >10k Ohms balanced
XLR/TRS Com Input >10k Ohms balanced
Bus inputs >10k Ohms balanced
Mix outputs XLR 100 ohms balanced
Mntr outputs XLR & TRS 100 ohms balanced
Headphones Stereo, Intended to drive > eight-ohms
Dimensions 17.5" in height (10u) x 19" in width x 4.5" in depth behind panel
Weight 30 pounds
Internal Power Supply 100 -240 VAC, 50/60 Hz
Warranty Five Years
XRM owner’s manual
Version 1.01 May 28, 2002
Crest P/N D7000028
Crest Audio
16-00 Pollitt Drive
Fair Lawn NJ 07410
(201) 475-4600
www.crestaudio.com
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