Bosch Blaupunkt GTA 400 Mode D'emploi page 3

Recommendation:
A power amplifier's performance is only as good as its installation. Proper
installation will maximise the overall performance of your audio system.
We recommend that you have our product installed professionally. Should
you decide to install the amplifier yourself, however, please read through
these instructions carefully, and take your time over the installation.
Finally, a word about your health: please bear in mind when playing
music in your car that sustained sound levels above 100 dB can dam-
age your hearing and may even result in total hearing loss. Modern
high-performance systems and high-quality loudspeaker configurations
are quite capable of generating noise levels above 130 dB.
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, in order to protect the battery in the event of a short-circuit
between it and the power amplifier. The amplifier's own fuse protects
the amplifier itself, but not the car battery. Disconnect the negative
terminal of the battery before carrying out installation and connec-
tion work.
Observe the vehicle manufacturer's safety instructions (regarding air-
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 dam-
age to vehicle components (battery, cables, fuse boxes). Fit the amplifi-
er in a suitable location, e.g. beneath the seats or in the trunk (Fig. 1).
The mounting location must also be dry, and provide sufficient ventila-
tion for cooling of the amplifier. Use cable grommets when passing ca-
bles through holes with sharp edges. Use loudspeakers with an imped-
ance of 2 to 4 Ω. Observe the max. power handling specifications (mu-
sic output). Do not connect the loudspeakers to ground; only use the
terminals provided. The cross-section of the positive and negative ca-
ble must be at least 6 mm 2 .
Amplifier GTA 400
The amplifier is suitable for connection to car radios with Cinch
connector.Use the Blaupunkt ISO Cinch adapter to connect the
amplifier to car radios with ISO connector. (7 607 893 093/ 7 607
855 094)
GTA 400
Quadro mode
Max power
Stereo mode
Max power
Quadro mode
RMS Power
Stereo mode
RMS Power
Tri mode
Frequency response
Signal-to-noise ratio
Stabilility
Input
sensitivity
Low-pass filter
High-pass filter
Bass-Boost
Preamp - In / -Out
Dimensions
D x W x H (mm)
Positive / negative connection
We recommend a cable cross-section of not less than 6 mm
standard commercial positive cable to the battery and connect to the
fuse holder. Use cable grommets when passing cables through holes
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
Loudspeaker connections ..................................................... Figs. 3 -7
4 x 100 Watt / 4 Ω
Fig.3
2 x 320 Watt /4 Ω
Fig.4
4 x 50 Watt / 4 Ω
Fig.3
2 x 150 Watt / 4 Ω
Fig.4
Fig.7
10 Hz - 55.000 Hz
> 80 dB
2Ω
0,1 - 8 V
40 - 160 Hz
100 Hz
0 / 9 / 18 dB
gold-plated
318 x 60 x 245,6
Connect remote amplifier connection to switchable
+12V
+12 V power source.
This enables the amplifier to be switched on and off with the radio's On/
Off switch.
Gain control
The gain 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 0.1 V to 8 V.
Adjust the input sensitivity in accordance with the manufacturer's spec-
ifications when connecting the amplifier to other radios.
Important: Turning the gain control clockwise increases the input sen-
sitivity of the amplifier, and thereby also the volume. The gain 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 vol-
ume is turned up on the radio.
Tri-mode loudspeaker connections
GTA amplifiers can be used in a combined mono/stereo mode (Fig. 7).
This facility enables the amplifier to be uq˚d simultaneously with stereo
satellite speakers (mid-range and tweeter) and a mono subwoofer.
The connections are somewhat more complicated in this case, as they
require the use of passive crossover networks (not supplied with the
amplifier) which divide the frequency ranges between the various loud-
speakers.
CAUTION: In tri-mode (combined mono/stereo mode) the amplifier must
be presented with a load of at least 2 Ohms (stereo satellite speakers)
or 4 Ohms (mono subwoofers). Lower loads cause overheating of the
amplifier and may damage it permanently.
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. The same applies to the
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. Loudspeaker, 4 Ohm (min. 2 Ohm).
Bridged loudspeaker connections
The GTA can also be bridged in a mono configuration. This enables you
to use the amplifier for one or more subwoofer(s) or a mid-range speak-
er. In this configuration the amplifier 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 amplifier 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.
Note: If the amplifier is to be used in the tri-mode configuration, the
crossover frequency selector switch must be set to "Flat" in order to
make the full frequency range available.
GTA 400
The type of crossover (i.e. "low-pass" or "hi-pass") and the desired cross-
over frequency can be selected on the GTA 400. If, for example, you
wish to drive a pair of subwoofers, connect in accordance with the low-
pass diagram,.The crossover frequency is dependent upon the loud-
2 . Run a
speaker frequency range (consult the loudspeaker manufacturer's data
for the recommended 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
90 Hz, the loudspeaker has a frequency range of 40 Hz to 90 Hz.
This information is subject to change without notice!
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8 622 402 414