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.
High-level inputs
The amplifier is equipped with high-level inputs
to permit connection to radios without preamp
outputs (Fig. 5). This enables direct connection
to be made to the radio’s loudspeaker output.
Level control
The Level control enables the input sensitivity
of the final stage to be matched to the output
voltage of your car radio preamp output.
The range of adjustment extends from 0.3 V to
8 V.
Adjust the input sensitivity in accordance with
the manufacturer’s specifications when connec
-
ting the amplifier to other radios.
Important:
Turning the Level control clockwise increases
the input sensitivity of the amplifier, and there
-
by 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 sy-
stem merely increases the volume more quickly
when the volume is turned up on the radio.
Loudspeaker connections
As with any audio component, connection of the
amplifier and speakers with the correct polarity
is essential for good bass reproduction. Ensure
therefore when connecting that the positive (+)
amplifier terminal is connected to the positive
(+) loudspeaker terminal. The same applies to
the negative (-) terminals. The left-hand ampli-
fier channel must also be connected to the left-
hand loudspeaker and the right-hand amplifier
channel to the right-hand loudspeaker.
Important:
The amplifier can sum the right- and left-hand si
-
gnal information only if both the right- and left-
hand RCA connections have been made.
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 1350. If, for example,
you wish to drive a pair of subwoofers, connect
in accordance with the low-pass diagram (fig.
6). The crossover frequency is dependent upon
the loud-speaker frequency range (consult the
loudspeaker manufacturer’s data for the recom-
mended frequency range).
“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 frequency range
of 10 Hz to 150 Hz.
Bass boost
You can adjust the bass output of the amplifier
using the bass boost control. The settings range
covers 0 dB to +12 dB.
SUB SONIC
The subsonic filter is used when a subwoofer is
connected to the amplifier. It can be adjusted in
order to protect the subwoofer against mechani
-
cal overload due to low bass frequencies that fall
outside our hearing range.
Operating indicator
(POWER / PROTECTION)
Green lamp: Power amp on, regular operating
condition
Red lamp: Power amp has been switched off
electronically, due to a fault or failure.
This information is subject to change without
notice!
