CPA240 Configurable Power Amplifier
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21031 CPA240 manual V1.31.doc
3.2.1 Amplifier Audio Bus
The amplifier audio bus provides a means by which 16 matrix outputs or destinations such as
those provided by the Alpha matrix controller can be connected simply to CPA240 amplifiers
within an equipment rack or suite.
Each amplifier is supplied with a single 40way-ribbon cable.
The cable is connected from the amplifier audio bus input connector to the switching matrix
(where the amplifier is adjacent to the matrix) or to the previous amplifier’s audio bus output
connector.
With the 16 matrix destinations essentially daisy chained to each amplifier an internal selector
matrix allows a single matrix destination to be connected to an individual amplifier channel.
3.2.2 Audio Bus selector
The audio bus selector enables an amplifier channel to be configured to a single matrix
destination or zone connected via the audio bus.
The audio bus selector is located inside the amplifier chassis on the D804 connection card.
3.2.3 Auxiliary Port - Direct Audio Input
Alternative means to connect audio sources to the amplifier is provided by the auxiliary port.
The ‘D’ type plug and socket arrangement allows bespoke cabling to be connected via solder
joints.
3.2.4 Auxiliary Port - Insert
In addition to the direct audio input connections, the auxiliary port provides insert points for each
amplifier channel.
This allows signal processing equipment to be connected or ‘inserted’ into the input of the
amplifier whilst retaining the efficiencies offered by the audio bus connection system.
The audio bus selector provides additional connection points for ‘insert’ configuration.
3.2.5 Auxiliary Port - Amplifier Linking
CPA240 power amplifiers can be connected in a parallel group to provide power for loads
greater than 240Watts. These connections are made using the auxiliary port. See ‘Amplifier
Configuration’.
3.2.6 Amplifier Output
The amplifier output plug and socket assembly provides screw terminals for four 100V
loudspeaker circuits and monitoring zero volt connections.
The screw terminals allow conductors of up to 2.5mm² to be connected.
Warning, high voltages exist on these terminals.
