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play area and is also shown for 3 seconds in the
large text section of the display. The Surround
Mode button scrolls through the available surround
sound modes when pressed repeatedly. The
surround modes are:
Stereo: The Stereo mode provides straight two
channel listening. With an analog source, it bypasses
all processing. With a digital input, only the bass-
management filtering is applied.
Pro Logic: Dolby Pro Logic decodes the center and
surround sound signals embedded in stereo movie
sound tracks from video, Laser Disc or TV. To
decode correctly, the source must be a Dolby
Surround or Dolby Stereo soundtrack.
Hall: In the Hall Surround mode, a realistic level of
ambiance is added to a normal stereo source such
as a CD or FM radio.
With any of the Digital Inputs 1, 2 & 3 (press Video
1, 2 or 3 respectively to select), the GTP-830 auto-
matically recognizes if the selected source carries a
Dolby Digital™ or DTS™ signal. Dolby Digital and
DTS have six independent channels available in
total: Left, Center, Right, Surround Left, Surround
Right and an “Effects Channel” (Subwoofer). With
either Dolby Digital 5.1 or DTS digital input, the
Stereo, Dolby Pro Logic and Hall surround modes
cannot be selected.
The Dolby Digital signal allows for several channel
configurations. Most two-channel Dolby Digital
recordings will allow the Pro Logic listening mode
to be applied.
[13] Bass/Treble controls:
The GTP-830 is fitted with Bass and Treble tone
controls to adjust the overall tonality of your sys-
tem. The 12 o’clock position is ‘flat’ with no boost
or cut and a detent indicates this position.
Rotate the control clockwise to increase the
amount of Bass or Treble. Rotate the control count-
er-clockwise to decrease the amount of
Bass or Treble. These controls affect the Left and
Right Front channels. The Tone controls do not
affect recordings made using the Tape or Video
line outputs.
PRODUCT FEATURES
ADCOM OWNER’S MANUAL | 13