Blaupunkt GTA 250 Bridged loudspeaker connections, ÒHigh- PassÓ frequency control, Bass boost

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. Òlow-passÓ or Òhi- passÓ) 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- turerÕs data for the recommended frequen- cy range).

ÒHigh- PassÓ frequency control

This control is active when the switch is in the ÒHi-passÓ 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.

ÒLow-passÓ frequency control

This control is active when the switch is set to ÒLow-passÓ 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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