10
GTA 250
nel must also be connected to the left-hand
loudspeaker and the right-hand amplifier
channel to the right-hand loudspeaker.
Bridged loudspeaker connections
The GTA can also be bridged in a mono con-
figuration. This enables you to use the am-
plifier for one or more subwoofer(s) or a mid-
range speaker. In this configuration the am-
plifier sums the right-hand and left-hand
channels, delivering a single channel (mono)
output.
Note:
The amplifier can sum the right- and left-hand
signal information only if both the right- and
left-hand RCA connections have been made.
CAUTION:
The amplifier must be presented with a
load of 4 Ohms or higher in bridged
mode. A lower load will cause the ampli-
fier to overheat or switch off. This can
lead to permanent damage of the unit.
Adjustment of the type and range
of the cross-over frequencies
The type of crossover (i.e. “low-pass” or “hi-
pass”) and the desired crossover frequency
can be selected on the GTA 250. If, for ex-
ample, you wish to drive a pair of subwoof-
ers, connect in accordance with the low-pass
diagram (fig. 3). The crossover frequency is
dependent upon the loud-speaker frequen-
cy range (consult the loudspeaker manufac-
turer’s data for the recommended frequen-
cy range).
“High- Pass” frequency control
This control is active when the switch is in
the “Hi-pass” position, and permits selection
of the desired crossover frequency. Exam-
ple: at a of 65 Hz, the loudspeaker has a
frequency range of 65 Hz to 30.000 Hz.
“Low-pass” frequency control
This control is active when the switch is set
to “Low-pass” and permits selection of the
desired crossover frequency. Example: at a
setting of 150 Hz, the loudspeaker has a fre-
quency range of 10 Hz to 150 Hz.
Bass boost
You can adjust the bass output of the ampli-
fier using the bass boost control. The set-
tings range covers 0 dB to +18 dB.
Operating indicator
(POWER / PROTECTION)
Green lamp: Power amp on, regular operat-
ing condition
Red lamp: Power amp has been switched
off electronically, due to a fault or failure.
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