SURROUND EFFECTS
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SURROUND SOUND EFFECTS
DOLBY PRO LOGIC Surround
The DD81 can play five different types of surround
Dolby Pro Logic is a surround format that uses an
sound depending on the program source and the
analog audio signal. It is the audio format used for
type of audio connection. The following section
most video cassette tapes and many television
describes the different types of surround sound.
broadcasts over-the-air and through cable and
satellite boxes. Although not normally used for
DOLBY DIGITAL Surround
radio broadcasts and music on CD’s and cassette
Dolby Digital is a surround sound format that uses
tapes, the Dolby Pro Logic surround sound
a digital audio signal. It is the audio format used for
function can be used for these sources when they
most Digital Video Discs (DVD) and for digital high
are broadcast or recorded in stereo. Dolby Pro
definition television broadcasts over-the-air and
Logic requires a stereo audio signal to operate – it
through digital cable and satellite boxes. Federal
does not work with mono audio signals.
law requires all television broadcasts to be made in
Dolby Pro Logic offers 5 channels of sound:
high definition format by 2006. Therefore, Dolby
Digital will become the dominant surround sound
1) Front left channel
format in the future. This DD81 music system is
2) Front right channel
ready when you are for adding digital TV and other
3) Center channel
digital audio/video components.
4) Rear channel (2 speakers)
Dolby Digital recordings and broadcasts have 6
The DD81 Dolby Pro Logic surround sound
channels of sound for the most authentic theater
function operates when:
experience. These six channels are sometimes
referred to as 5.1 channels – five full-range and
An optional stereo television, Hi-Fi VCR or
one low frequency effects (LFE) channel. The LFE
DVD player is connected to the audio inputs
channel has special low frequencies that can be
on the rear of the DD81.
played back through an optional powered
subwoofer. This creates frequencies so low, you
The program source (tape, disc or broadcast)
can “feel” them. The digital signals used in Dolby
is recorded in Dolby Pro Logic Surround
Digital provide the most accurate sound
Sound .
reproduction available.
And, the digital input selector is properly set
1) Front left channel
according to the connection made between
2) Front right channel
the component and the DD81.
3) Center channel
4) Left rear surround channel
5) Right rear surround channel
6) Low frequency channel
The DD81 built-in, Dolby Digital surround sound
processor will only operate when:
(Continued on next page)
An optional digital audio/video component
such as a DVD player, HDTV, digital cable
or digital satellite box is connected to
the DD81.
The optional component is connected to the
DVD or AUX/TV digital inputs on the rear of
the DD81.
The program source (disc or broadcast) is
recorded in Dolby Digital Surround
Sound .
And, the digital input selector is properly set
according to the type of audio connection
made between the component and the DD81.
