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A. Wiring for Non-biamplified Installations
All wiring diagrams shown thus far in this manual are for non-biamplified, single amplifier
application. Care should be taken that all connections are properly served with tinned wires or spade
lugs, if required. The wire should be chosen on the basis of that gauge that will result in no more than
0.5 dB loss between the amplifier and the loudspeaker. Details of wire loss calculation are given in
Section VI-D.
B. Wiring Diagram for
Figure 29 shows a wiring diagram for one of three screen channels of a biamplified
installation. Here, we have shown a generic electronic dividing network with HF and LF outputs. This
approach is now giving way to stereo amplifiers that include electronic frequency division as an input
feature, such as the IM-12 module that is included in the ' Open Input Architecture' options available
for JBL' s MPA-series power amplifiers.
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A complete biamplified installation would require five stereo amplifiers. Three of these would
be used for the screen channels, and one each for the surround and subwoofer channels. A stereo
amplifier dedicated to the surround channel would facilitate reconfiguration of. that channel for stereo
operation (split surrounds).
Figures 30 and 31 show block diagrams for typical three channel passive and biamplified
cinema systems respectively. These examples should serve as guidelines for system specification,
and the exact configuration of the system should be left to a qualified cinema systems engineer.
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Biamplified Installation
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