Note that only one amplifier is needed to drive all the surround speakers, since the total acoustic output requirement is no greater than in any other channel. Series-parallel wiring, as appropriate, should be used. 3 - Four Surround Speakers Ancillary Equipment. Most studios have an array of signal processors available, and some are indispensable for proper Dolby Surround production. Instruction on the use of the equipment may also be provided at this time.
Dolby consultants are also available for a variety of production assistance or training.
The unit also provides switchable stereo and monaural monitoring modes for evaluating compatibility. A ganged master fader allows all output channels to be varied together. The SDU4 is available for purchase through Dolby professional products dealers. Figure 1 shows the typical signal flow. 1 - Monitoring Dolby Surround Programmes Speakers and amplifiers.