search mode. When tuned accurately to a station,
“TUNED” will light up in the display.
[6] Tune/Preset Button
The Tune/Preset button toggles between the Preset and
Tune mode. When Preset mode is selected, “PRESET”
lights up in the display area. Refer to the Tuner Up/Down
button [5] description for more information.
[7] Display Window
The display area shows all vital information when the unit
is operational.
[8] Volume Knob
The Volume control adjusts the overall loudness of the
signals being fed to the preamplifier outputs. Unlike con-
ventional controls, the GTP-860’s volume control doesn’t
have a start or end position. Volume can also be adjusted
from the remote control using the Master Volume Up or
Down buttons [34]. The Volume control does not affect
recordings made using the Tape, Video 3 and Video 4
outputs but will affect the signal going to the Preamp
Outputs. The volume level is indicated in the display
panel when it is being adjusted, and after three seconds
the display defaults to its previous status. Volume setting
can range from -61dB to +18dB.
On the remote control, press the Mute button [32] to
temporarily switch off the sound to the Preamp outputs
and headphones. Mute mode is indicated by “MUTING”
flashing in red in the display area. Press Mute again to
restore sound. Mute does not affect recordings made
using the Tape, Video 3 and Video 4 outputs but does
affect the signal going to the Preamp Outputs.
[9] Headphone Output/Video 5 Input
A 1/4” stereo jack socket is provided for headphone lis-
tening and will work with conventional headphones of any
impedance. The volume and tone controls are operative
for headphone listening. Use a suitable adapter to con-
nect headphones with other types of connectors such as
3.5mm stereo ‘personal stereo’ jack plugs. Inserting a
headphone will automatically turn off the signals from the
Preamp Outputs, and set the listening mode to Stereo.
NOTE: Head phones are only LF RF output. If listening to
5.1 material center channel should be turned off.
REMEMBER: Listening at high levels can damage your hearing.
The video five input is located on the front panel to sim-
plify connection of a camcorder or a video game console.
To select video five, push the corresponding front panel
button in the input selector section.
[10] Surround Backs Button
Pressing this button engages ADCOM’s proprietary 7.1m²™
decoding algorithm. The 7.1m²™ decoding process mixes
the signals from the left surround and right surround chan-
nels to derive two unique signals sent to each back output.
The benefit of our 7.1m²™ decoding process is enhance
imaging between the surround speakers and the creation
of a more diffuse ambient sound field. The 7.1m²™ pro-
cess has the same benefits when compared to other matix
decoding as stereo signals have over mono signals. The
7.1m²™ process can also be used to drive your surround
back speakers when you are listening to an externally
decoded DVD audio or SACD multi-channel disc. Due to
the varying nature of film soundtracks and music, you may
prefer to activate or deactivate the surround back chan-
nels. For example, Dolby Digital 5.1 and DTS soundtracks
benefit greatly from the addition of the 7.1m²™ process-
ing. Prologic soundtracks on the other hand provide a
mono surround signal track, which yields a less satisfying
experience when using the surround back channels.
The level of the Surround Back channels can be adjusted
in the same manner as the other channels, either through
the On-Screen-Display (OSD) or with the Bal. or Test func-
tions from the remote control. Be sure to experiment to
find the balance that best suits your taste.
[11] Input Selector Buttons
These buttons select the active video and audio input for
the GTP-860. The source that is currently selected will be
shown in the front panel display and the LED in the source
button will be red. The currently selected source signal
is sent to the main preamp outputs after processing and
the video 3, video 4, aux and tape outputs. If an input
has both digital and analog input capabilities the GTP-
860 will give priority to an existing digital signal, and in
the absence of a digital signal will default to the analog
connection. Video signals associated with an input give
priority to s-video sources over composite video signals.
The video one and video two inputs also have component
video switching capabilities. This component video
ADCOM GTP-860 OWNER’S MANUAL | 9