CPA240 Configurable Power Amplifier
Page 19 of 35
21031 CPA240 manual V1.31.doc
Example shows connection of amplifier input 1 to direct to Zone 8 and input 2 to Zone 9A/9B
via a Graphic EQ and 37W aux port.
Note: Shorting the ‘Send’ signal path will significantly reduce the signal level on the
audio bus ‘zone’. This will in turn affect all equipment connected to this ‘zone’.
5.3 Volume Control Gain Option
The nominal gain of the amplifier with the volume controls set to maximum is +42dB (0dB i/p –
100V o/p). An additional 10dB gain for each channel is available by fitting the ‘CH+10dB’ link.
Links for each channel:
•
CH1+10dB
•
CH2+10dB
•
CH3+10dB
•
CH4+10dB
The link headers are located on the D800 control card (lower front).
5.4 Linking Amplifier Frames (Parallel Group)
The CPA240 provides an amplifier linking or grouping facility via additional circuitry and the
auxiliary port connector. This allows a group of amplifiers to be paralleled giving increased
power to a speaker circuit i.e. paralleling 3 x 180 Watt amplifiers could drive a 540 Watt speaker
circuit.
The maximum permitted amplifier group is five frames i.e. up to 1200Watts
General configuration:
•
One amplifier within the group is set as a ‘controller’ the other as ‘slaves’.
•
Only channel 1 of the amplifier is ‘linked’ while the other channels are configured as slaves
(to required power) see ‘master/slave’ section.
•
Only channel 1 volume control of the control amplifier adjusts the group level.
•
The output of each amplifier within the group is paralleled using the speaker circuit output
cable (manually wired).
•
All amplifiers within a group must have the same power configuration i.e. 180 Watts
•
All amplifiers within the group must be adjusted to have an identical power output.
I/P
Chain
Send
1 2 3 4
1
8
9
16
Audio Bus Channel
I/P
O/P
Send
Return
2
2
EQ
Zone 8
Zone 9A
Aux Port
37W
Send 2
Ret 2
Zone 9B
Ret 1
Return
1
Aux Port
37W
Amp 1
Amp 2
