Blaupunkt GTA 1350 Operating And Installation Manual page 7

Example connections
power.supply.connection.........................fig..2.
connection.of.car.radio.with.cinch.
output.......................................................fig..3.
loudspeaker.connections.. . ......................fig..4.
high-.input................................................fig..5
+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.
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!