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results, start with the Left channel set at 0dB and to
match the other channels to it. Normally, if the Right
speaker is located at the same distance from the listening
position to the Left speaker it should be set at the same
level as the Left speaker.
Press the Test button again to leave or cancel the Test
mode; any changes will be memorized
automatically.
NOTE: There is no output in the Subwoofer during noise
sequencer operation; therefore it is difficult to adjust the level
in test mode. The Subwoofer level can be adjusted in the OSD
setup menu with musical input.
After setting the balance with the Test function, you may
wish to make further adjustments by ear, depending on
the material you are listening to. There are two ways to
access the Channel Balance screen, which allows you to
adjust levels while monitoring a source.
Highlight CHANNEL BALANCE in the SETUP menu and press
Select on the remote. You will see a screen similar to the
following:
The GTP-860 allows the volume of each speaker to be
individually trimmed so that none of the speakers domi-
nates in playback and detracts from the surround illusion.
Highlight the speaker you wish to adjust, using the Up and
Down arrow buttons. Use the Left arrow button to lower
the output level, and the Right arrow button to raise the
output level. Each speaker can be adjusted within a -10
to +10dB range, in steps of 1dB. The back channels can be
adjusted within a -60 to +10 dB range, in steps of 2dB.
Highlight SAVE & EXIT and press Select to save the set-
tings and return to the SETUP menu.
The Channel Balance menu can also be accessed directly
with the bal button [39] on the remote control.
3.3 Channel Delays
For the best surround sound performance it is important
that sound from all speakers reach the listener’s ears
at the same time. Because the surround/rear speakers
are usually closer to the listener than the front speak-
ers, there is a tendency for the ear to localize sounds
to the rear, because the ear takes most notice of the
sounds that arrive at the head first. Similarly, the center
speaker is often closer to the listener than the front left
and right speakers. To compensate for this, the GTP-860
can slightly delay the audio sent to the center and rear
(closer) speakers. In this way, when playing Dolby Digital
or Dolby Pro Logic soundtracks, the sound from all speak-
ers arrives uniformly at the listening position as intended
by the film’s producer.
Each millisecond corresponds approximately with
1 foot or 30.5 centimeters.
To set the center channel delay time:
Call up the SETUP menu of the On Screen Display.
Select the Channel Delays menu:
Choose CENTER and select the desired delay time
(1, 2, 3, 4 or 5ms).
To set the surround channel delay time:
Use the Up or Down arrow buttons [39] to highlight the
Surrrounds.
ADCOM GTP-860 OWNER’S MANUAL | 27
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
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