ately limited in dynamic range and frequency bandwidth
for the surround channel and thus only requires speakers
of far lesser capabilities compared to the front channels.
Dolby Digital, however, is a full range system with two
independent surround channels and with dynamics equal
to that of the front channels. For this reason it is advis-
able to choose loudspeakers which are similar in power
handling and performance capability to those of the front
channels. If you are using only one pair of surround speak-
ers, make sure to connect them to the Surround Rear
outputs. If you choose to install another pair of surround
speakers, locate them behind your listening position, and
connect them to the Surround Back outputs. Surround
Back channels add to the spaciousness and coherence of
the sound field, but the Surround Rear channels must be
present for the desired effect.
Many film soundtracks rely heavily on very low frequency
sound effects which are difficult for normal or smaller
hi-fi speakers to reproduce. To faithfully reproduce these
low frequencies you can use a specially designed low
frequency loudspeaker with its own built-in amplifier
(“active subwoofer”). Because it is difficult to hear which
direction very low frequencies are coming from, you only
normally need one subwoofer and this can be placed
virtually anywhere in the room. Dolby Digital uses a dedi-
cated Low Frequency Effects (LFE) channel. If a subwoofer
has been selected, the LFE channel will be fed to the sub-
woofer output.
First you need to indicate which speakers are present in
your system. Besides the Main speakers (Left & Right),
these can include a Center, two Surround Speakers and a
Subwoofer.
Call up the SETUP menu of the On Screen Display.
Select the SPEAKER SETTINGS.
Highlight PRESET and use the Left and Right arrow buttons
to select the preset (PRESET 1, 2 or 3) that best applies
to your setup. Select a preset based on speaker sizes,
then use the Up and Down arrow buttons to adjust for the
absence of Center, Surround speakers, or subwoofer.
Preset 1:
Default Setting / Adjustment
Main
: LARGE / No Adjustment
Center
: LARGE / OFF
Surround
: LARGE / OFF
Subwoofer
: ON / OFF
In this mode, all speaker channels are large, i.e. full
range, and the home theater system has a subwoofer. This
preset is particularly useful for large rooms.
Preset 2:
Default Setting / Adjustment
Main
: LARGE / No Adjustment
Center
: SMALL / OFF
Surround
: SMALL / OFF
Subwoofer
: OFF / ON
This preset is useful for a home theater system that does
not have full range speakers. The bass frequencies from
the center and surround channels are redirected to the
main speakers.
Preset 3:
Default Setting / Adjustment
Main
: SMALL / No Adjustment
Center
: SMALL / OFF
Surround
: SMALL / OFF
Subwoofer
: ON / No Adjustment
This preset is ideal for those systems using 5 small speak-
ers combined with a subwoofer. The bass frequencies from
each of these 5 channels are redirected to the subwoofer.
The Surround settings affect both the Surround Rear and
Surround Back speakers.
ADCOM GTP-860 OWNER’S MANUAL | 29
SETUP
1 INPUT SETTINGS
2 CHANNEL BALANCE
3 CHANNEL DELAYS
4 SPEAKER SETTINGS
5 EXIT
INPUT SETTINGS
AUDIO=VIDEO 3
VIDEO=VIDEO 3
MODE=5 CH STEREO
DYNAMIC RANGE=N/A
CENTER WIDTH=N/A
DIMENSION=N/A
DO NOT SAVE AND EXIT
SAVE AND EXIT
CHANNEL BALANCE
LEFT
:
0dB
CENTER : - 3dB
RIGHT :
0dB
REAR R :
0dB
BACK R :
0dB
BACK L :
0dB
REAR L :
0dB
SUB
:
0dB
DO NOT SAVE AND EXIT
SAVE AND EXIT
CHANNEL DELAYS
CENTER :
1ms
SURROUNDS : 5ms
DO NOT SAVE AND EXIT
SAVE AND EXIT
SPEAKER SETTINGS
PRESET : 1
MAIN : LARGE
CENTER : OFF
SURROUND : LARGE
SUBWOOFER : ON
DO NOT SAVE AND EXIT
SAVE AND EXIT
INPUT SETTINGS
AUDIO=VIDEO 3
VIDEO=VIDEO 3
MODE=STEREO
DYNAMIC RANGE=N/A
CENTER WIDTH=N/A
DIMENSION=N/A
DO NOT SAVE AND EXIT
SAVE AND EXIT