Blaupunkt GTA 4 Spezial Bedienungsanleitung Seite 9

+12V
Connect remote amplifier connection to
switchable +12 V power source.
This enables the amplifier to be switched on
and off with the radio's On/Off switch.
Level control
The Level control enables the input sensi-
tivity of the final stage to be matched to the
output voltage of your car radio preamp out-
put.
The range of adjustment extends from 0.1 V
to 8 V.
Adjust the input sensitivity in accordance with
the manufacturer's specifications when con-
necting the amplifier to other radios.
Important:
Turning the Level control clockwise increas-
es the input sensitivity of the amplifier, and
thereby also the volume. The Level control
is however not a volume control; an increase
in volume is not achieved in the maximum
position, even if this subjectively appears to
be the case. The system merely increases
the volume more quickly when the volume
is turned up on the radio.
Loudspeaker connections
(If the amplifier is to be connected in a
bridged mode, proceed with the section
"Bridged loudspeaker connections".)
As with any audio component, connection
of the amplifier and speakers with the cor-
rect polarity is essential for good bass re-
production. Ensure therefore when connect-
ing that the positive (+) amplifier terminal is
connected to the positive (+) loudspeaker
terminal. The same applies to the negative
(-) terminals. The left-hand amplifier chan-
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GTA 4 SPEZIAL
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 4 Spezial. If, for
example, you wish to drive a pair of sub-
woofers, connect in accordance with the low-
pass diagram (fig. 3). The crossover frequen-
cy is dependent upon the loud-speaker fre-
quency range (consult the loudspeaker man-
ufacturer's data for the recommended fre-
quency range).
"High-Pass"
At a frequency of 80 Hz , the loudspeaker
has a frequency range of 80 Hz to 26.000 Hz.
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