Denon AVR-4800 manual Dolby Surround 1Dolby Digital Dolby Surround AC-3

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	Dolby Digital	Dolby Pro Logic
No. recorded channels (elements)	5.1 ch	2 ch
No. playback channels	5.1 ch	4 ch
Playback channels (max.)	L, R, C, SL, SR, SW	L, R, C, S (SW - recommended)
Audio processing	Digital discrete processing Dolby Digital (AC-3) encoding/decoding	Analog matrix processing Dolby Surround
High frequency playback limit of surround	20 kHz	7 kHz
channel

2Dolby 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		Dolby Digital output jacks		Playback method (reference page)
LD (VDP)		Coaxial Dolby Digital RF output jack		Connect to an outboard AC-3 RF demodulator, and
1	2	1	2	connect to a digital input, coax or optical
DVD		Optical or coaxial digital output		Set the input mode to “AUTO”
		(same as for PCM)
2				(Page 40)
			3
Others		Optical or coaxial digital output		Set the input mode to “AUTO”.
(satellite broadcasts, DTV, etc.)		(same as for PCM)		(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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