Denon AVR-1804

36
ENGLISH
Manufactured under license from Dolby Laboratories.
“Dolby”, “Pro Logic” and the double-D symbol are trademarks of Dolby Laboratories.
(2) Dolby Pro Logic II
• Dolby Pro-Logic II is a new multi-channel playback format developed by Dolby Laboratories using feedback
logic steering technology and offering improvements over conventional Dolby Pro Logic circuits.
• Dolby Pro Logic
II can be used to decode not only sources recorded in Dolby Surround ( ) but also regular
stereo sources into five channels (front left, front right, center, surround left and surround right) to achieve
surround sound.
• Whereas with conventional Dolby Pro Logic the surround channel playback frequency band was limited,
Dolby Pro Logic
II offers a wider band range (20 Hz to 20 kHz or greater). In addition, the surround channels
were monaural (the surround left and right channels were the same) with previous Dolby Pro Logic, but
Dolby Pro Logic
II they are played as stereo signals.
• Various parameters can be set according to the type of source and the contents, so it is possible to achieve
optimum decoding (see page 24).
Sources recorded in Dolby Surround
These are sources in which three or more channels of surround have been recorded as two channels of
signals using Dolby Surround encoding technology.
Dolby Surround is used for the sound tracks of movies recorded on DVDs, LDs and video cassettes to be
played on stereo VCRs, as well as for the stereo broadcast signals of FM radio, TV, satellite broadcasts and
cable TV.
Decoding these signals with Dolby Pro Logic
II makes it possible to achieve multi-channel surround
playback. The signals can also be played on ordinary stereo equipment, in which case they provide normal
stereo sound.
There are two types of DVD Dolby surround recording signals.
q 2-channel PCM stereo signals
w 2-channel Dolby Digital signals
When either of these signals is input to the AVR-1804, the surround mode is automatically set to Dolby
Pro Logic
II when the “DOLBY/DTS SURROUND” mode is selected.
2 Sources recorded in Dolby Surround are indicated with the logo mark shown below.
Dolby Surround support mark:
2 Dolby Digital compatible media and playback methods
Marks indicating Dolby Digital compatibility: .
The following are general examples. Also refer to the player’s operating instructions.
Media
LD (VDP)
DVD
Others
(satellite broadcasts, CATV, etc.)
Dolby Digital output jacks
Coaxial Dolby Digital RF output jack
1
Optical or coaxial digital output
(same as for PCM) 2
Optical or coaxial digital output
(same as for PCM)
Playback method (reference page)
Set the input mode to “AUTO”.
(Page 19)
Set the input mode to “AUTO”.
(Page 19)
Set the input mode to “AUTO”.
(Page 19)
1 Please use a commercially available adapter when connecting the Dolby Digital RF output jack of the
LD player to the digital input jack.
Please refer to the instruction manual of the adapter when making connection.
2 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-
1804, 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-1804.
• Set the front speakers with their front surfaces as
flush with the TV or monitor screen as possible. Set
the center speaker between the front left and right
speakers and no further from the listening position
than the front speakers.
• Consult the owner’s manual for your subwoofer for
advice on placing the subwoofer within the
listening room.
• If the surround speakers are direct-radiating
(monopolar) then place them slightly behind and at
an angle to the listening position and parallel to the
walls at a position 60 to 90 centimeters (2 to 3 feet)
above ear level at the prime listening position.
2. When not using surround back speakers
Front speaker
60 to
90 cm
As seen from the side
Surround speaker
Subwoofer
Surround speakers
Front speakers
60°
Monitor
Center speaker
As seen from above
120°
Surround
The AVR-1804 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 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 – 22 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 encoding/decoding
20 kHz
Dolby Pro Logic
2 ch
4 ch
L, R, C, S (SW - recommended)
Analog matrix processing Dolby
Surround
7 kHz