Coomber 705 Operating Instructions

Operating Instructions: 705 Multisound Centre
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CONNECTING UP
Extension Speakers
For optimum performance connect
a pair of 4Ω extension speakers into
loudspeaker sockets on the rear panel
(i.e. Coomber model 415).
If four speakers are required, each must
have an impedance of 8Ω. Damage to
the amplifier could otherwise occur.
Coomber Booster Speakers
amplified loudspeakers (i.e Coomber
model 2186) can be connected to the
two Ext. Amp sockets on the rear panel.
They can be used with or without
extension loudspeakers.
Battery
The MultiSound Centre can be powered by an external 12v battery
connected via the D.C. 12V socket in the rear panel.
Note that battery life is primarily dependant upon its condition and
the volume settings.
Battery condition can be checked by pressing the battery check button
(3). The record level indicators (5) will illuminate. A battery in good
condition will illuminate all four indicators.
SWITCHING ON
Mains power: A Mains ON/OFF switch is found on the left side panel.
Switching on will make the power LED (4) illuminate. The CD player
LCD panel will also be backlit.
Battery power: When connected to a battery, the power LED (4) will
illuminate on the front panel. The CD player LCD panel will also be
backlit. Note: Should the mains be switched on while the battery is
connected, no damage will occur due to a protection circuit.
USING THE MULTISOUND CENTRE
Volume and Sound Quality
Volume, bass, treble and balance controls (1) can be adjusted as
required. They will not affect recording quality.
Headphone Socket
Connecting stereo headphones to the headphone socket (7) auto-
matically disconnects the extension loudspeakers but not booster
speakers connected to the Ext. amp sockets. For safety - use only
Coomber 1929 stereo headphones (600 ohm).
6 C 7 8
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9 10 11 12
Auxiliary output
The aux output sockets (8 & 9) both provide a low level stereo output.
Mono Switch
Pressing the mono switch (2) gives mono sound. The stereo indicator
(7) will extinguish.
Source and Inputs
The row of red buttons
external source - perhaps a record player or mini disc (line)
cassette recorder (tape)
CD player (disc)
radio (tuner) connected to external tuner only via plug (6)
microphone, guitar or keyboard etc (mic/aux)
To select a source, press the appropriate button. Leave the MIX control
A in the mid position.
Working with Inputs
The four INPUT sockets are simultaneously active allowing a variety of
"Live" signal sources to be connected and passively mixed for listening
or recording.
A mic connected to 'R/mono' socket (13) will produce a signal on
both channels. Stereo mics should be connected to the 5 pin DIN 'MIC
AUX' socket (11) or both 'L' (12) and 'R/mono' (13) sockets.
Guitars and Keyboards should be connected to the 'AUX' socket (10) or
5 pin DIN 'MIC AUX' socket (11).
"Mixing" Sources and Inputs
You can "mix" any of the four sources with the mic/aux inputs so that,
for example, you could play a CD or tape and accompany it using a
microphone.
To begin, select one of the four sources (line, tape, disc or tuner) and
press the red button in along with the red input button
The green mix LED C will illuminate.
The mix of source against input can be adjusted by turning the MIX
control A .
Remember that the inputs are passively mixed (the amplifier takes the
two signals and mixes them together simultaneously) - so you could
connect a keyboard and microphone and "mix" those combined inputs
with a source.
Coomber
A
B
13
B will select either the:-
B .