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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 22)
Set the input mode to “AUTO”.
(Page 22)
Set the input mode to “AUTO”.
(Page 22)
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-
2105, 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-2105.
• 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 cm 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-2105 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
(2) Dolby Pro Logic IIx
• Dolby Pro Logic
IIx furthers the matrix decoding technology of Dolby Pro Logic II to decode audio signals
recorded on two channels into up to 7.1 playback channels, including the surround back channel. Dolby Pro
Logic
IIx also allows 5.1-channel sources to be played in up to 7.1 channels.
The mode can be selected according to the source. The Music mode is best suited for playing music, the
Cinema mode for playing movies, and the Game mode for playing games. The Game mode can only be
used with 2-channel audio sources.
