Manual Boston Acoustics gt 40 (page 12 of 19) (English)

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Mono Subwoofer Operation

If the ampliﬁer is to be bridged and used with a subwoofer connected to the REAR channels, use the

“SPEAKER OUTPUT” terminals marked for mono use.

WARNING! Subwoofer impedance must not fall below 2 ohms when in MONO mode.

Installation—Fuses & Wiring (cont.)

1) Music

The material chosen for head unit/ampliﬁer system setup must be both clear in recording quality and dynam-

ic in amplitude. Many audiophile “test” discs have musical tracks with both of these characteristics and should

be used.

2) FRONT & REAR Sensitivity Controls

Turn controls all the way counterclockwise (minimum position). In this position,

the ampliﬁer will be less sensitive to the input signal from the head unit.

Setup Tuning—Full-range Speakers

FRONT crossover control

REAR crossover control

3) FRONT & REAR Crossover Controls

Crossovers should be turned off during this phase of set-up. Move the HIGHPASS and FILTER switches to

the “OFF” position—with these settings, full-range signal is sent to the FRONT & REAR speaker outputs.

2-ohm minimum

GT-40_manual 4/10/03 4:17 PM Page 12

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Boston Acoustics gt 40 Manual

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