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About surround sound – Polk Audio RMDS-1 User Manual

Page 24

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D

D

D

Polk customer service (800) 377-7655

24

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:

Stereo

2 channel Dolby Digital

DVD, DSS satellite TV (only with

2/0

special Dolby Digital equipped
satellite receivers), Digital TV
broadcasts (future)

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,

3/2.1

Digital TV broadcasts (future)

Stereo

2 channel Dolby Surround

Most Hi-Fi video tapes, some TV

(Pro Logic) encoded

broadcasts

Pro Logic Surround

2 channel Dolby Surround

Most Hi-Fi video tapes, some TV

(Pro Logic) encoded

broadcasts

Stereo

2 channel stereo

FM radio stations, CDs, LP records,
most TV broadcasts

Pro Logic Surround

2 channel stereo

FM radio stations, CDs, LP records,
most TV broadcasts

STEREO

STEREO

DIGITAL

D

D DIGITAL

D

D DIGITAL

D

D

D

D

D

PRO LOGIC

PRO LOGIC

PRO LOGIC

The RMDS-1 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 and mono 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
RMDS-1 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.

ABOUT SURROUND SOUND

The RMDS-1 is manufactured under license from Dolby Laboratories Licensing Corporation. “Dolby,” “AC-3,” and the double-D symbol are trademarks of Dolby Laboratories Licensing Corporation.