Audio AD114 User Manual

CONTENTS

INTRODUCTION 1
UNPACKING 1
VISUAL INSPECTION 1
SPECIFIC POINTS 1

IMPORTANT SAFETY INSTRUCTIONS 3

POWERING 4

TECHNICAL SPECIFICATION 6

EQUALISATION CURVES 9

BLOCK DIAGRAM 10

CONNECTOR PANEL 11
CONNECTIONS 12

INPUT MODULE 14

OUTPUT MODULE 16
ADJUSTMENT & CALIBRATION 18

AD100-015 POWER SUPPLY UNIT 20

CUSTOMER NOTES AND FACTORY MODIFICATIONS 21

TECHNICAL LIBRARY 22

INTRODUCTION

Unpacking

If there are any signs of damage to the outside of the carton, please notify us or your
supplier immediately, regardless of the unit's apparent physical condition. This is in
case a claim has to be made at a later date because of previously undetected transit
damage. The packaging material should not be discarded until the mixer has been
acceptance tested and a suitable transit/storage case is available for secure, safe
storage.

Visual Inspection

Identification - please make a separate note of the serial number for your own capital
equipment records. Ensure that it agrees with the number on the invoice/packing
note. The serial number label is on the back cover, adjacent to the battery
compartment.

Temperature - check the meter glasses for condensation. If the package has been
in transit during cold weather, leave the mixer for at least 12 hours to allow it to return
to normal room temperature. Any measurements or subjective tests then made, will
be to a known temperature reference.

Specific Points

Battery compartment - the mixer has an integral battery compartment to accept
6size-AA cells, and is built into the transversal extrusion.

DC-DC converter - is mounted on the right hand module. Care must be taken when
removing the module, because some wire looms connect from the module to the
base boards.

In order to facilitate the testing and calibration of all modules, a set of two extender
modules is available from the factory.

Connectors - for convenience, the connector panel is labelled for reading from
above. All connectors are in line with their corresponding module.

1

Fuse - to protect the mixer and internal power supply is mounted on the power
supply/converter board. Access is gained by removing the DC-DC converter module.
A resettable polyfuse is fitted; therefore maintenance should not normally be
required. The fuse resets after removal of the fault causing the overload.

Limiter threshold - is set at the factory at +8dBu (PPM 6), but an internal preset
potentiometer allows adjustment to any other level above 0dBu. The limiters are to
be found on the output module printed circuit board.

Microphone powering - the mixer will remain unconditionally stable if the powering on
unterminated input channels is switched off - this also improves the noise
performance and crosstalk. Powering - 48V phantom may be selected before or
after the microphone is connected to the module.

Module fix screws - Hexagon head screws are used to fix the modules and back
cover. The size is 1.5mm HEX A/F with a 2.5M thread. If it becomes necessary to
remove modules or back cover it is strongly advised using a good quality hexagonal
head driver. Use of a screwdriver, however desperate, is not recommended.

We wish you many trouble- free hours of use from your mixer. As a company, we are
fully committed to BS EN ISO 9001. Should you have any problem or require any
further information on mixers or the M-S microphone technique, please do not
hesitate to contact us on 01543 375351 or by fax on 01543 361051.

2

WARNING

IMPORTANT SAFETY INSTRUCTIONS

The user of electrical products must be familiar with their potential dangers, and
fundamental precautions must always be taken. Please read the following text
carefully.

Power supply units manufactured by Audio Developments Ltd are not user
serviceable. There are no user-serviceable parts associated with any such power
supply unit.

THE OUTER COVERS MUST NOT BE REMOVED

Such a power supply unit is solely for use with audio mixers and sound processors ­hereafter called the equipment - manufactured by Audio Developments Ltd.
Always use a cord set accepted by a National Approved Body.

EARTHING/GROUNDING: When using an external power supply unit that is
connected to the mains supply to drive the mixer it must be CONNECTED TO
EARTH.

In certain types of malfunction or breakdown, earthing provides a path of least
resistance for electric current and considerably reduces the risk of electric shock.

DANGER: Incorrect connection of the equipment grounding/earthing conductor can
result in the risk of electric shock. Where possible obtain a pre-wired mains lead
from a reputable supplier with the correctly fitted mains connector for the type of
mains outlet in use; otherwise, one correctly wired and checked by a qualified
electrical engineer. If your mains lead is not suitable for the mains outlet, have the
correct plug fitted by qualified personnel.

The MAINS PLUG of this equipment is the primary disconnect device. Therefore, in
the final application, ensure it remains close to the equipment and easily accessible.

3

POWERING

The mixer may be powered from either internal cells or an external DC power source.

The integral battery compartment requires a total of 6 size-AA cells. Access is
gained via a captive lid which is retained by one 90-degree-turn buckle. The lid
hinges outwards from the bottom panel. When installing new cells please ensure
they are inserted with the correct polarity rotation.

Either conventional dry or rechargeable nickel-cadmium cells may be used.
However, no recharge facility for ni-cads exists within the mixer. This must be carried
out externally.

When driving the mixer from an external power source, PIN 1 is the 0V connection
and a voltage in the range +9V to +15V DC should be supplied to PIN 4. The power
source should be capable of delivering approximately 400mA - allowing some
capacity for phantom powering.

If an external power supply unit (PSU) is to drive the mixer, a current capability of at
least 400mA is required. It is poor practice to run a PSU at its limit; therefore we
recommend a minimum of 600mA.
Audio Developments AD100-15 PSU is a suitable unit.

WARNING: When NOT using the PSU (AD100-15) supplied for the mixer, ensure
your 4-pin XLR is correctly wired to match the POWER IN connector. Failure to do
so may result in the breakdown of the internal DC-DC converter. Make this check
even if using a PSU which may have been supplied to you in the past, eg AD100-06.

4

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5

TECHNICAL SPECIFICATION - ELECTRICAL

REFERENCE 0dB=775mV at 1kHz unless otherwise stated.

MAX GAIN (Mic/Line Module) MIC 70dB LINE 40dB
(Line Module) LINE 6dB

MAX INPUT LEVEL MIC @ Max Gain -44dBu @ Min Gain + 6dBu
LINE @ Max Gain -14dBu @ Min Gain +26dBu
LINE MODULE +20dBu
STEREO-RETURN +18dBu

INPUT IMPEDANCE MIC >2k5R
LINE >6k5R
STEREO-RETURN >100kR

MIC POWERING 48V PHANTOM

MAX OUTPUT +23dBm L-R TRANSFORMER BAL
+18dBm H’PHONE MONITOR UNBAL

OUTPUT IMPEDANCE <60R L-R
<20R MONITOR

FREQUENCY RESPONSE 0: -1dB L-R
0: -1.5dB MONITOR PATHS

HARMONIC DISTORTION <0.05% @ 1kHz @ 0dBm OUTPUT
<0.15% @ 40Hz to 15kHz @ +15dBm OUTPUT

OVERLOAD INDICATOR ILLUMINATES @ +15dBu at PRE-FADER POINT

CROSSTALK <-70dB 40Hz to 15kHz
INTERGROUP & INTERCHANNEL

NOISE MIC <-126dB EIN 20Hz to 20kHz;

200R SOURCE

LINE <77dB SNR 20Hz to 20kHz 0dBu IN & OUT

EQUALISATION HF: ±10dB @ 10kHz

LF: ±10dB @ 100Hz

MF: ±15dB
CENTRE FREQUENCY 2k5Hz Q=1.2

HPF: PRE-TRANSFORMER 12dB/OCTAVE

-3dB @ 150Hz -3dB @ 90Hz

6

OUTPUT LIMITER THRESHOLD +8dB
RATIO 7:1
ATTACK 4mS
RELEASE 250mS

CURRENT CONSUMPTION 130mA (4 INPUT) 12V DC SUPPLY

7

TECHNICAL SPECIFICATION - MECHANICAL

SIZE

ALL DIMENSIONS IN MILLIMETRES

WEIGHT 2.3 Kg (Excluding batteries)

8

20

15

10

EQUALISATION CURVES

AD 114 HIGH AND LOW EQ

5

0

dB

-5

-10

-15

-20
10 100 1000 10000 100000

FREQUENCY

LF BOOST

LF CUT

HF BOOST

HF CUT

AD 114 MID EQ AND HPF

20

15

10

5

0

dB

-5

-10

-15

-20
10 100 1000 10000 100000

FREQUENCY

9