DD-8 Power Ampliers
Operation Manual8
Back Panel1. Bus Output
Provides a line-level RCA connector loop/passthru output for conne cting multiple DD-8 ampliers in a
system utilizing a single bus input signal.
If the DD-8 is used as a single zone amplier and the input signal is connec ted via the Bus Input, that
signal can be output via this pair of RCA connectors to additional DD -8 ampliers connected in the
same manner.
NOTE: The number of DD-8 ampliers that can be conne cted in this manner is limited by the
output voltage of the signal source device driving the bus input as it must suppor t the total
impedance of all of the bussed devices.
2. Bus Input
Provides a line-level RCA connector input to simultaneously fe ed all speaker output channels utilizing
a single bus input signal.
When the DD-8 is used as a single zone amplier, all channels can be driven using only the bus inp ut
without the need for connection to each channel’s local input individuall y. If the bus input is used with
the DD-8 congured for stereo operation, the Lef t input signal will be routed to all four Left speaker
outputs and the Right input signal will be routed to all four Right speaker outputs .
If the bus input is used with the DD-8 congured for all mono oper ation, either the Left or Right Bus
Input RCA connector can be used to feed all eight speaker output s. (See the section on “Stereo/Mono
Selection” for more information.) In this case, using only one input connec tor will attenuate the gain
by 6dB. A “Y-adaptor” RCA cable can be used at the input to maintain full gain if desired .
BaSIc operatIon
WARNING: Do not connect the outputs
of one channel to the outputs of othe r
channels or to other ampliers.
CAUTION: Never make or break connections
to the DD-8 unless the DD- 8 and all
associated components are powered o!
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1 3 4 7 1110 10
6 95 8
1. Bus Output
2. Bus Input
3. Local Inputs
4. Output Level Controls
5. Stereo/Mono Selection
6. Local/Bus Selection
7. Speaker Outputs
8. Signal Sense On/O
9. Power Save On/O
10. Trigger In/Out
11. AC Main Power Connector