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Surround
The AVR-4800 is equipped with a digital signal processing circuit that lets you play program sources in the surround mode to achieve the same
sense of presence as in a movie theater.
Dolby Surround
(1) Dolby Digital (Dolby Surround AC-3)
Dolby Digital is the multi-channel digital signal format developed by Dolby Laboratories.
Dolby Digital consists of up to “5.1” channels - front left, front right, center, surround left, surround right, and an additional channel exclusively
reserved for additional deep bass sound effects (the Low Frequency Effects – LFE – channel, also called the “.1” channel, containing bass
frequencies of up to 120 Hz).
Unlike the analog Dolby Pro Logic format, Dolby Digital’s main channels can all contain full range sound information, from the lowest bass, up
to the highest frequencies – 20 kHz. The signals within each channel are distinct from the others, allowing pinpoint sound imaging, and Dolby
Digital offers tremendous dynamic range from the most powerful sound effects to the quietest, softest sounds, free from noise and distortion.
2 Dolby Digital and Dolby Pro Logic
Comparison of home surround systems
No. recorded channels (elements)
No. playback channels
Playback channels (max.)
Audio processing
High frequency playback limit of surround
channel
Dolby Digital
5.1 ch
5.1 ch
L, R, C, SL, SR, SW
Digital discrete processing Dolby Digital (AC-3) encoding/decoding
20 kHz
Dolby Pro Logic
2 ch
4 ch
L, R, C, S (SW - recommended)
Analog matrix processing Dolby Surround
7 kHz
2 Dolby Digital compatible media and playback methods
Marks indicating Dolby Digital compatibility: and .
The following are general examples. Also refer to the player’s operating instructions.
Media
LD (VDP)
1 2
DVD
2
Others
(satellite broadcasts, DTV, etc.)
Dolby Digital output jacks
Coaxial Dolby Digital RF output jack
1 2
Optical or coaxial digital output
(same as for PCM)
3
Optical or coaxial digital output
(same as for PCM)
Playback method (reference page)
Connect to an outboard AC-3 RF demodulator, and
connect to a digital input, coax or optical
Set the input mode to “AUTO”
(Page 40)
Set the input mode to “AUTO”.
(Page 40)
1 Please use a commercially available adapter when connecting the Dolby Digital RF (AC-3RF) output jack of the LD player to the digital input
jack. The AVR-4800 does not include a Dolby Digital AC-3 RF demodulator function.
Please refer to the instruction manual of the AC-3 RF demodulator/adapter when making connections.
2 When the LD/DVD compatible player is equipped with Dolby Digital RF outputs, the LD’s Dolby Digital output is output from the RF jacks
and the DVD’s Dolby Digital output is output from the optical or coaxial digital jacks. Select the input mode according to the type of media
being played (LD or DVD). You may wish to connect the outboard RF demodulator’s digital output to the AVR-4800’s VDP input.
3 Some DVD digital outputs have the function of switching the Dolby Digital signal output method between “bit stream” and “(convert to)
PCM”. When playing in Dolby Digital surround on the AVR-4800, switch the DVD player’s output mode to “bit stream”. In some cases
players are equipped with both “bit stream + PCM” and “PCM only” digital outputs. In this case connect the “bit stream + PCM” jacks
to the AVR-4800.
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