Adcom GTP-860II manual Delay Config, Input Config, Channel Balance and Channel Test

3.3 Delay Config

DELAY CONFIG
FRONT L/R DIS:	10ft
CENTER DIS:	8ft
SURROUND DIS:	5ft
DELAY UNIT:	FEET
RETURN TO SETUP

For the best surround sound perfor- mance 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 speakers, there is a tendency for the ear to localize sounds to the rear, because the ear gives precedence to 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 com- pensate for this, the GTP-860IIcan slightly delay the audio sent to the center and rear (closer) speakers. In this way, when playing Dolby Digital or Dolby Pro Logic sound tracks, the sound from all speakers arrives uni- formly at the listening position as intended by the film’s producer.

To configure the channel delays, measure or estimate the distance for each of the speakers to the main listening location. The GTP-860IIwill automatically configure the cor- rect settings for processing. Note, the information can be input in either feet or meters by selecting the desired unit in the DELAY UNIT field.

3.4Channel Balance and Channel Test

CHANNEL		TEST
LEFT:		0dB
CENTER:		1dB
RIGHT:		0dB
REAR	R :	0dB
BACK	R :	0dB
BACK	L :	0dB
REAR	L :	0dB
SUB:		0dB

RETURN TO SETUP

The output levels of each of the speakers connected to the GTP-860IImay need to be adjusted so that there is an even balance of sound from all the speakers in the system. If, for instance, the relative volume level of the front left and right speak- ers is too high relative to the center speaker, dialog may be difficult to understand. If on the other hand, the center speaker is set too loud, all sound will seem to be coming from only the center channel speaker.

The best method for setting the channel balance is to use a sound pressure level meter (available from Radio Shack) and the built-in test tone generator in the GTP-860II. To access the test tone, navigate to the channel test page on the OSD. Be car- ful to lower the master volume level first because the test tone signal can be very loud. The noise signal will be heard from the speaker that is currently selected. By navigating through the speakers and monitor- ing the sound level on the meter, the level adjust for each speaker can be determined. It is best to keep the sound level meter at the most central listeing seat for these adjust- ments. Note that the tone color of the noise coming from the subwoofer will be different than from the other speakers; this is due to the limited frequency response of a subwoofer. Due to limititions of most sound-level meters it is best to adjust the sub- woofer level while listening to music.

CHANNEL BALANCE

LEFT:		0dB
CENTER:		3dB
RIGHT:		0dB
REAR	R :	0dB
BACK	R :	0dB
BACK	L :	0dB
REAR	L :	0dB
SUB:		0dB

RETURN TO SETUP

If you wish to adjust the channel lev- els without using the test tone, then select the Channel Balance menu

or push the bal [40] button on the remote. Note that only speakers that you selected in the speaker configura-

tion menu will be available.

3.5 Input Config

INPUT CONFIG

SOURCE:	VIDEO 2
INPUT:	OPTICAL2
EXT 5.1:	OFF
MODE:	DOLBY D

RETURN TO SETUP

The input configuration menu allows you to configure the audio input for each of the source buttons and to set a default surround mode for each source.

The source selection allows you to select which of the input buttons you wish to configure.

The input section is used to determine what audio input the source will use. The options are the analog stereo input associated with the source or to over- ride the analog input and use one of the six digital inputs.

The ext. 5.1 section allows you to select the 6 channel audio input usu- ally associated with a DVD audio or SACD player for the source button you are configuring.

ADCOM GTP-860 II Owner’s Manual 25