Sound LAB G743AA User manual

SoundLab Mixer Amplifier
G743AA
User Manual
Thank you for buying a professional Soundlab mixer amplifier. This product
incorporates the latest in mixer amplifier technology and should provide the
user with high quality trouble free sound for many years. To help you derive
the most from you Soundlab mixer amplifier please carefully read the
following user manual.
User Manual for G743AA (M415P)
Important Notes
1. This manual is part of the product and should be kept with the unit at all
times. Please read it carefully before using the product. A copy of this
manual is available on request www.electrovision.co.uk
2. This is a professional product and is not designed for use in a domestic
environment.
Safety Precautions Risk of Electric Shock
1. This product must be earthed at all times.
2. Connection to the mains should be by the mains lead supplied. Fixed
installations should only be undertaken by a qualified person.
3. The product and the mains lead should be checked regularly for
damage. Any repair should only be undertaken by a qualified person.
The product and the mains lead should be tested each year by a
qualified person (this is a legal requirement).
4. Do not expose this product to rain, moisture, extremes of temperature,
acids, alkalies or any other corrosive or reactive agents. Failure to do so
may lead to a risk of fire, electrical shock or product failure/damage.
5. Make sure the power supply is switched off before connecting this
product to the mains supply. All volume controls should be set at zero.
6. Do not attempt to open the enclosure. There are no user serviceable
parts inside. All repairs/inspections should be undertaken by a qualified
person.
7. Disconnect from the mains when not in use.
8. This amplifier can produce high sound pressure levels that can lead to
hearing damage. It is the user’s responsibility to regulate the sound
level according to the environment it is used in. In fixed installations the
!

use of a sound-limiting device is recommended. This can be viewed at
www.electrovision.co.uk.
9. Do not allow liquid or foreign objects to be inserted into this product.
Should this happen by accident do not attempt to repair the product.
Repairs should only be undertaken by a competent person.
10. Do not subject the product to heavy impacts. This can cause internal
damage that can go unnoticed by visual inspection.
11. This mixer amplifier is heavy. Take care when lifting. Seek advice if you
are not sure how to lift an item correctly.
12. The mixer amplifier should be placed on a safe, stable and level surface
that is vibration free. Always make sure the product is stable and
cannot fall when in use. When used on a mobile stand always check the
stand is capable of accepting the weight of the product. The stand
should be checked for defects before mounting the product. Never use
this product on a stand that is damaged or is not capable of accepting
the weight of the product.
13. This product is not suitable for domestic use.
14. When used in a fixed installation the product should be installed by a
qualified personal in accordance with the relevant health and safety
legislation.
Operating Precautions.
1. Do not turn the amplifier up so that the sound becomes distorted. This
will damage the speakers and could damage the internal amplifier. This
is not covered by the guarantee.
2. Make sure this product is switched off and all volume controls are
turned down before connection to the mains (see controls and
functions). All items connected to the unit (CD players, electric
instruments etc.) should be switched off and volume controls turned
down before connection to the mains (see instruction books for the
appropriate product). A surge protection device is recommended for
use with this product. The amplifier should be switched on first and
then connected products.
3. Position the product correctly and safely before switching on. See item
13 of the safety precaution guide.
4. Only use high quality interconnecting leads. They will improve the
sound quality. These can be viewed at www.electrovision.co.uk
5. This product should only be cleaned with a damp cloth. Do not use any
cleaning agents such as detergents or solvents.
6. Do not use any spray cleaners or lubricants on any of the controls or
switches. Make sure the speakers are connected before switching on.
The speaker leads should be checked for damage before use. Only use
high quality speaker leads. These can be viewed at
www.electrovision.co.uk

Controls and Functions
Channels 1-4 (Diag. 1)
1. Contour.A tone control that increases or decreases the treble
frequencies for the channel (+/- 10dB @ 10K.)
2. Reverb. Sets the Level of internal reverb for the channel when used in
conjunction with the master reverb level.
3. Level. Increases or decreases the channel level relative to the other
channels being used. The level should be turned all the way down when
not in use.
4. Line. 6.35mm (1.4”) high impedance input that accepts line level source
equipment.
Rated input level : 0dB
Input impedance : 22K Ohm
5. Mic. XLR balanced line input optimised for a microphone or other low
impedance sources. Pin 2 is positive. This connector has a 15V
phantom power supply on pins 2 and 3 at all times when used with the
phantom power button (see Dia 2 item 7). Pin 1 is ground).
Warning.
Because of the phantom power only connect microphones or products with low
impedance balanced line outputs. Always check the manufacturer’s specifications before
connecting.
1
2
3
4
5
OUTPUTS
LEVEL
010
CONTOUR
LINE MIC
-15
0
+15
REVERB
0
0
10
1 2 3
CONTOUR
LEVEL
LINE MIC
REVERB
-15 +15 0 10
00
-15 +15 0 10
00
-15 +15 0
0
CONTOUR
LEVEL
LINE
CONTOUR
LEVEL
LINE MIC
REVERB
CHANNEL THREE CHANNEL F
CHANNEL TWO
CHANNEL ONE
010 010 010
INPUT
T2A A/S 250V
5 X 20mm
(Part No. F126L)
Complies with
EN 60065 EN 55103
230V~50Hz 200VA
Ta max - 35ºC
100W@8
150W@4
WARNING: TO REDUCE THE RISK OF
FIRE OR ELECTRIC SHOCK DO NOT
EXPOSE THIS EQUIPMENT TO RAIN
OR MOISTURE.
FOR PROFESSIONAL USE ONLY.
THIS UNIT MUST BE EARTHED
0
0
010
-15
0
+15 0
0
10 -15 0 10
00
-15 +15 0 10
00
010 010 010
+15 -15 +15
Diag. 1
OUTPUTS
MASTER LEVEL
MASTER REVERB
DELAY TIME
010 010 010
INTPUTS
+ 1
5V
PHANTOM
POWER
OUTPUTS
2 3 4
MIC
REVERB
10
0
-15 +15 0 10
00
-15 +15 0 10
00
CONTOUR
LEVEL
LINE MIC
LOW
MAIN REV/AUX AUX FOOT SW
-15
0
+15
MID
-15
0
+15 -15
0
+15
REVERB
CONTOUR
LEVEL
LINE MIC
REVERB
CHANNEL THREE CHANNEL FOUR MASTER EQUALISAT ION
TWO
010 010
HIGH
POWERED MIXER
INPUT
PIN 2 +VE
PIN 1 GND
PIN 3 -VE
8
W@4 FOOTSWITCH
G743AA (M415P)
WARNING: TO REDUCE THE RISK OF
FIRE OR ELECTRIC SHOCK DO NOT
EXPOSE THIS EQUIPMENT TO RAIN
OR MOISTURE.
FOR PROFESSIONAL USE ONLY.
Model G743AA
1 x 150W
Latching (Closed: Reverb Off)
010 010 010
INTPUTS
+ 15V
PHANTOM
POWER
OUTPUTS
010
00
-15 +15 -15
0
+15 -15
0
+15
-15 0 10
00
10
0
010 010
+15 -15 +15
0
123
45
Diag. 2
6
78 9 10 11
12
13

Output controls (Diag. 2)
1. Low. Increases or decreases the amount of bass (low deep sound
such as drums etc.) frequencies on the post mixed sound.
2. Mid. Increases or decreases the amount of mid frequencies (such as
vocals, lead guitars etc.) on the post mixed sound.
3. High. Increases or decreases the amount of high (treble) frequencies on
the post mixed sound
4. Master Level. Controls the overall volume level of the system.
5. Master Reverb. Controls the amount of reverb in the main mix.
6. Delay Time.Increases or decrease the time factor of the reverb unit (6).
7. Phantom. Provides a 15V phantom power to channels 1-4 when
pressed down.
Warning : Make sure all channels are turn down before turning this on or off. Do not plug
or unplug microphone after this is switched on. Do not use this if you are using any
unbalanced products connected to the 3 pin XLR. It can cause damage.
8. Main (Output). 6.35mm (1/4”) full output for sending a source signal to
another amplifier.
9. Rev/Aux (send output). 6.35mm output for use with external effects
products.
10. Aux (Input,) 6.35mm Input for allowing a line level input into the main
mix. The internal reverb unit does not effect this input.
11. Foot SW. 6.35mm input for use with a latching foot switch (push to
make, push to break). The footswitch is used to turn the reverb unit on
or off. Foot switches can be view @ www.electrovision.co.uk
12. On/off switch. Switches the mains power on or off.
13. On/off Power LED. When illuminated the Led indicates that the
product is receiving power.

Rear. (Diag. 3)
1. Speaker Outputs 6.35mm output for connection to speakers.
Warning. Do not connect or disconnect the speakers while the unit is switched on. All
connections should be made before switching on the power and all volume controls
should be turned all the way down.
2. Fuse holder. Contains the fuse that protects the product.
3. Mains cable. Connects the product to the mains supply.
Warning. Make sure all connections have been made and all volume controls have been
turned down before switching on.
Connections
Diag. 3
1
2
OUTPUTS
T2A A/S 250V
5 X 20mm
(Part No. F126L)
Complies with
EN 60065 EN 55103
230V~50Hz 200VA
Ta max - 35ºC
100W@8
150W@4
WARNING: TO REDUCE THE RISK OF
FIRE OR ELECTRIC SHOCK DO NOT
EXPOSE THIS EQUIPMENT TO RAIN
OR MOISTURE.
FOR PROFESSIONAL USE ONLY.
THIS UNIT MUST BE EARTHED
3
INPUTS
Line XLR
Balanced
Un-Balanced
PIN 2 +VE
PIN 2 +VE
PIN 1 GND
PIN 1&3 GND
PIN 3 -VE
FOOTSWITCH
Latching (Closed: Reverb Off)
+VE
GND

Specifications
Total harmonic distortion . . . . . . . . . . . . . . .less than 0.5% 20 Hz-20 KHz
Frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 Hz-20 KHz
S/N ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .>80dB
Channel EQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .High 12 KHz
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Mid 2.5 KHz
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Low 80 Hz
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .230Vac @ 50 Hz
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10Kg
Dims . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .438 x 270 x 134mm
Inputs No Mode Input Impedance Level Connector
Microphones 4 Balanced 2K Ohm -30dB XLR
Line In 4 Unbalanced 22K Ohm 0dB Mono 6.35mm Jack
Aux In 1 Unbalanced 10K Ohm 0dB Mono 6.35mm Jack
Outputs
Power Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 Ohm 100W RMS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Ohm 150W RMS
Line Out . . . . . . . . . . . . . . . . .Unbalanced >600 Ohm Mono 6.35mm Jack
Rev/Aux Out . . . . . . . . . . . . . .Unbalanced >600 Ohm Mono 6.35mm Jack

Electrovision Ltd.
Lancots Lane
Sutton Oak
St Helens
Merseyside
WA9 3EX
UK
Tel. [phone]
Fax [phone]
www.electrovision.co.uk