3
8 622 403 270
Safety precautions
Instructions for installation and connection
Fit a fuse in the amplifier power line no more than 30 cm from the vehi-
cle battery
between it and the power amplifier
the amplifier itself, but not the car batteryDisconnect the negative
terminal of the battery before carrying out installation and connec-
tion work.
Observe the vehicle manufacturer
bags, alarm systems, trip computers, vehicle immobilisers).
The final stage must be installed professionally for reasons of safety
The mounting surface must be suitable for the screws provided, and
must provide firm support.
When drilling holes, take care to avoid damage to vehicle components
(battery
Fit the amplifier in a suitable location, e.g. beneath the seats or in the
trunk (Fig. 1). The mounting location must also be dry
ficient ventilation for cooling of the amplifier
passing cables through holes with sharp edges. Use loudspeakers with
an impedance of 2 to 4 Ω (see table or installation drawing). Observe
the max. power handling specifications (music output). Do not connect
the loudspeakers to ground; only use the terminals provided. The cross-
section of the positive and negative cable must be at least 6 mm
2
.
GTA 280 amplifier
The amplifier is suitable for connection to car radios with Cinch connec-
torUse the Blaupunkt ISO Cinch adapter to connect the amplifier
to car radios with ISO connector
Applications and loudspeaker connection
Stereo-Mode
Max Power 2 x 80 WΩ Fig.3
Mono-Mode
Max Power 1 x 220 Watt /4 Ω Fig.4
Stereo-Mode
RMS Power 2 x 40 WΩ Fig.3
Mono-Mode
RMS Power 1 x 1Ω Fig.4
Frequency response 10 Hz - 26.000 Hz
Signal-to-noise ratio > 80 dB
Stability 2 Ω
Input- 0,3 - 8 V
sensitivity
Low-pass filter 40 - 460 Hz
High-Pass filter 65 - 4500 Hz
Dimensions
D x W x H (mm) 170 x 57 x 243
Positive/negative connection
We recommend a cable cross-section of not less than 6 mm
2
. Run a
standard commercial positive cable to the battery and connect to the
fuse holder
with sharp edges. Bolt a standard commercial negative cable to a ground
point free of induced noise (car body bolt, body panel) - not to the neg-
ative battery pole. Clean the contact surface of the ground point down
to bare metal and coat with antiseize graphite petroleum.
Integral fuses
The integral fuses within the amplifier protect the final stage and the
entire electrical system in the event of a fault. Never bridge fuses or
replace fuses with a higher current rating.
Example connections
Power supply connection ............................................................ Fig. 2
Connection of car radio with cinch output ................................... Fig. 3
Loudspeaker connections ........................................................ Fig. 3-5
+12V
Connect remote amplifier connection to switchable
+12 V power source.
This enables the amplifier to be switched on and off with the radio’
Off switch.
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 spec-
ifications when connecting the amplifier to other radios.
Important: T
sitivity of the amplifier
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 vol-
ume 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 correct polarity is essential for good bass reproduction. Ensure
therefore when connecting that the positive (+) amplifier terminal is con-
nected to the positive (+) loudspeaker terminal.
negative (-) terminals. The left-hand amplifier channel must also be con-
nected to the left-hand loudspeaker and the right-hand amplifier chan-
nel to the right-hand loudspeaker
Bridged loudspeaker connections
The GT
to use the amplifier for one or more subwoofer(s) or a mid-range speak-
er
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.
overheat or switch off. This can lead to permanent damage of the
unit.
GTA 280
The type of crossover (i.e. “low-pass” or “hi-pass”) and the desired cros-
sover frequency can be selected on the GT
wish to drive a pair of subwoofers, connect in accordance with the low-
pass diagram (fig. 2a).The crossover frequency is dependent upon the
loudspeaker frequency range (consult the loudspeaker manufacturer’s
data for the recommended frequency 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
65 Hz, the loudspeaker has a frequency range of 65 Hz to
26.000 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
40 Hz, the loudspeaker has a frequency range of 40 Hz to 10 Hz.
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!
F
Introduction
Félicitations! V
me. En optant pour un GT
du son de très haute qualité. Que vous intégriez l‘amplificateur
GT
hi-fi, l‘amélioration de la qualité du son, que vous aurez bien du
mal à ne pas remarquer
d‘écoute!
Blaupunkt s’ef
vice de ses appareils toujours plus claires et de lecture facile. Si malgré
cela, vous émettiez des doutes sur un point quelconque du manuel,
n’hésitez pas à vous adresser à votre représentant agréé Blaupunkt ou
à composer le numéro du centre d’assistance téléphonique de votre
