Adcom GTP-760 owner manual

The speaker size menu allows you to describe the size and number of speakers in your system to the GTP-760. The descriptive words LARGE and SMALL that appear in the MAIN field mean the following:

LARGE: The speaker is full range and capable of reproducing the entire audible frequency spectrum 20Hz to 20kHz. The GTP-760 sends a full range signal to LARGE speakers without any crossover filtering.

SMALL: The speaker is not capable of reproducing the deepest bass portion of the audible frequency range 20Hz to 100Hz. The GTP-760 sends a high-pass filtered signal to SMALL speakers. The filter crossover point is 100Hz (12dB/octave). The low frequency information filtered out, the below 100Hz part of the signal, is redirected to other full range speakers or the subwoofer.

For the center, rear and subwoofer fields, the choices ON and OFF appear and mean the following:

ON: The speaker is active and receives the audio information intended. In addition, although not displayed, the speaker is either LARGE or SMALL depending on the configuration of the main speakers or subwoofer as described below in the presets.

OFF: The speaker is inactive. Audio signals intended for speakers set to the OFF position are redirected to the main speakers.

While there are a large number of setup possibilities, ADCOM has provided 3 factory presets that target the most typical installations.

Preset 1 - Main: Small, Center: On, Rears: On, Subwoofer: On

For the typical home theater system of 2 main speakers, 1 center speaker, 2 rear speakers and a subwoofer, factory preset 1 is recommended. In this case, the main, center and rear speakers are all SMALL/high-passed. The bass frequencies from each of these 5 channels are redirected to the subwoofer. The 0.1 LFE channel that carries the low frequency impact during explosions and other movie soundtrack special effects is also repro- duced by the subwoofer. The subwoofer output is limited from 20Hz to 100Hz by a 12dB per octave filter. For this preset also, when listening to conventional 2 channel stereo music, the subwoofer reproduces the low frequency information of the left and right channels.

Preset 2 - Main: Large, Center: On, Rears: On, Subwoofer: Off

When a home theater system does not have a subwoofer, it is assumed that the main speakers are full range and can reproduce the low frequency portion of a movie soundtrack. In this case, preset 2 is recommended. Here the main speakers are set to LARGE and the center and rears are SMALL/high-passed. The center and rear channel low frequency information is redirected to the front channels as is the 0.1 LFE special effects channel. In conventional 2 channel stereo playback, the main speakers carry the entire spectrum.

Preset 3 - Main: Large, Center: On, Rears: On, Subwoofer: On

A third factory preset allows for user customization of the system. In this mode, the main, center and rear channels are all LARGE (full range 20Hz to 20kHz). In addition, the GTP-760 subwoofer crossover is disabled. THE GTP-760 SUBWOOFER OUTPUT IS FULL RANGE. In this way, the crossover built in on most active subwoofers can be manually set to match the response of the rest of the speakers in the system. The subwoofer’s crossover completely dictates the low frequency response of the system. This feature eliminates any unintended interaction that might occur between the internal crossover of the GTP-760 and the built in crossover of the subwoofer in the other preset modes.

Using the < and > remote buttons select the fields individually as desired. Use the> or > choices and return to the SETUP menu.

preset that best applies to your system or change the speaker arrow keys to highlight DONE and press select/play to save you

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