ABOUT SURROUND SOUND

The DS-2 system offers four modes of operation: Stereo, Dolby Pro Logic, 2 channel Dolby Digital and Dolby Digital 5.1 surround. You might wonder, “what is 2 channel Dolby Digital? Isn’t Dolby Digital always 5.1 surround?” The answer is no. Dolby Digital is a digital audio compression system that provides very high fidelity sound quality in either 2 or 6 channels. (The six channels are Left and Right front, Center, Left and Right rear and a Low Frequency Effects channel, or 5.1). The vast majority of Dolby Digital program materials are 5.1 multi-channel recordings. Most DVDs have both 2 channel and 5.1 channel Dolby Digital soundtracks. In most cases the default soundtrack is the 2 channel Dolby Digital soundtrack and you must manually select the 5.1 channel soundtrack via the DVD’s menu (see your DVD player’s manual for instructions). But some DVDs only have a 2 channel Dolby Digital soundtrack permitting only Dolby Pro Logic surround sound.

You can use the Pro Logic mode with stereo sources such as radio, CD, and tape to get very good surround sound, even though those sources are not Dolby Surround encoded. Dolby Surround encoding is compatible with stereo playback, so conventional stereo programs sound similar to surround encoded program when played with the Pro Logic surround mode engaged. You may want to leave the DS-2 in the surround mode all the time.

The chart below shows which modes are possible with which inputs, and how to tell which mode you are in by looking at the front panel display.

When you see this

That means you are

And your program

That can be delivered by

on the display:

listening to:

material is:

these sources:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DD

DD DIGITAL

 

 

 

Stereo

2 channel Dolby Digital

DVD, DSS satellite TV (only with

2/0

 

 

 

 

 

 

 

 

 

special Dolby Digital equipped

 

 

 

 

 

 

 

 

 

 

 

satellite receivers), Digital TV

 

 

 

 

 

 

 

 

 

 

 

broadcasts (future)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DD

DD DIGITAL

 

 

PRO LOGIC

Pro Logic Surround

2 channel Dolby Digital

DVD, DSS satellite TV (only with

2/1

 

 

 

 

 

 

 

 

 

special Dolby Digital equipped

 

 

 

 

 

 

 

 

 

 

 

satellite receivers), Digital TV

 

 

 

 

 

 

 

 

 

 

 

broadcasts (future)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Dolby Digital 5.1 Surround

5.1 channel Dolby Digital

Most DVDs, some 12" laserdiscs,

 

DD

DD DIGITAL

 

 

3/2.1

 

 

 

 

 

 

 

 

 

Digital TV broadcasts (future)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Stereo

2 channel Dolby Surround

Most Hi-Fi video tapes, some TV

 

STEREO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Pro Logic) encoded

broadcasts

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pro Logic Surround

2 channel Dolby Surround

Most Hi-Fi video tapes, some TV

 

PRO LOGIC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Pro Logic) encoded

broadcasts

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

STEREO

 

 

 

 

 

 

Stereo

2 channel stereo

FM radio stations, CDs, LP records,

 

 

 

 

 

 

 

 

 

 

 

most TV broadcasts

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PRO LOGIC

 

 

 

 

 

Pro Logic Surround

2 channel stereo

FM radio stations, CDs, LP records,

 

 

 

 

 

 

 

 

 

 

 

most TV broadcasts

The DS-2 is manufactured under license from Dolby Laboratories Licensing Corporation. “Dolby,” “AC-3,” and the double-D symbol are trademarks of Dolby Laboratories Licensing Corporation.

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Polk Audio 2 instruction manual About Surround Sound, Digital TV broadcasts future, Pro Logic encoded Broadcasts

2 specifications

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