5
SR703 | SR707 CONTRACTOR AMPLIFIER
English
REAR PANEL
5. Gain Controls
These two knobs are the level controls for channels one
and two respectively� Turning clockwise will increase its
gain and counter clockwise will decrease its gain� Please
always powerup with the volume all the way down,
and increase the volume slowly to make sure that no
conditions exist which could annoy your audience or harm
your speakers�
6. CH1/CH2 Inputs (XLR Connectors)
These inputs are provided for making balanced connection
to mixers, preamps, etc� The XLR inputs are wired as per
the following convention: Pin 2 – Hot, Pin 3 – Cold, Pin
1 – Ground�
7. Barrier Strip Inputs
These connection points provide the best option for
permanent or long-term installation� Connections should
be screwed down tight to exclude oxygen, and care
should be taken to avoid loose strands of wire that may
cause short circuits�
8. CH1/CH2 Parallel Pass Through XLR Connectors
These XLR output connectors are provided for parallel
connection to another SR or other amplifier.
9. Stereo / Parallel / Bridge Switch
In
Stereo
operation, two separate signals are treated
separately by channels 1 and 2 of the amplifiers.
In
Parallel
operation, one signal is treated by bother
channel 1 and 2 of the amplifier. In other words, a signal
connected to Input CH1 (6) or CH2 (7) is sent to both
Ouput CH1 (10) and CH2 (11)�
In
Bridge
operation, both channels are configured to
drive a single load with a single signal to CH1 (only CH1
is operative, and CH2 input must be vacant) at twice the
power�
IMPORTANT:
This switch should only be adjusted when
the amplifier is off as to avoid damaging speakers.
10. Direct Output Connectors, CH1/CH2
These are barrier strips to connect low impedance
speakers� Spade lugs and bare wires should both be
screwed down tight to exclude oxygen, and care should
be taken to avoid loose strands of wire that may cause
short circuits�
11. Audio Transformer Outputs, CH1/CH2
These are barrier strips to connect distributed line (25V,
70V, 100V, 140V and 200V)� Spade lugs and bare wires
should both be screwed down tight to exclude oxygen,
and care should be taken to avoid loose strands of wire
that may cause short circuits�
1
2
3
4
5
8
9
10 11
6
7
