User`s manual

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Dolby

CP650 Digital Cinema Processor User’s Manual Reference Information

C-3

A Center screen channel is necessary to ensure the precise localization of front

sounds for all viewers, including those seated off to the sides. Dolby Digital

Surround EX brings similar benefits to the surround sound field. With Surround EX,

a Back Surround channel is reproduced by the speaker array at the back of the theatre,

while Left Surround and Right Surround channels are reproduced by the side arrays.

This means that sounds can now be positioned behind the audience, allowing for

exciting new effects, such as true 360-degree pans.

The Back Surround channel also makes front-to-back and back-to-front transitions

more realistic. Flyovers really seem to pass overhead, rather than down the sides of

the theatre. Even ambient sound reproduction is improved, being less affected by the

width of the theatre. Equally important, the new Back Surround channel ensures that

even viewers seated close to the left or right of the theatre experience the total

surround ambience intended by the filmmaker.

The UEX/650 kit upgrades the CP650D 5.1-channel processor to include three

surround channels that can play digital prints prepared with the Dolby Digital

Surround EX process. The installation requires wiring the surround speakers into left,

and right groups. Two power amplifier channels are required for powering the two

groups of Back Surround channel speakers.

Left surround

Back surround left

Right surround

Back surround right

Dolby Digital

5.1 mode

Surround

amplifiers

Dolby CP650

Bsl

Bsr

Bsl

Bsr

Figure C-3 Surround Speaker/Amplifier Switching for 5.1-Channel Operation