Connection Examples; Level Control - Blaupunkt GTA 270 SF Bedienungsanleitung

GTA 270 SF
When selecting the installation location, select a dry loca-
tion that offers sufficient air circulation for cooling the
amplifi er.
The GTA 270 SF must not be installed on rear shelves, rear
seats or other locations that are open to the front.
The installation location must be suitable to accept the ac-
companying screws and provide a fi rm support.
The amplifi er power cable must be fi tted with a fuse no more
than 30 cm from the battery to protect the vehicle battery in
case of a short circuit between power amplifi er and battery.
The fuse of the amplifi er protects only the amplifi er, not the
vehicle battery.
Use loudspeakers with 2 - 4 Ω impedance (see table or in-
stallation drawing). Observe the maximum power handling
capacity (music output). Do not connect loudspeakers to
earth, use only the referenced terminals.
Amplifi er GTA 270 SF
The amplifi er is suitable for connecting a car sound system
with cinch connections.
For the connection to car sound systems with ISO connec-
tion, use Blaupunkt ISO cinch adapters (7 607 893 093 or
7 607 855 094).
Application options and loudspeaker connection
Stereo Mode
Max power
Mono mode
Max power
Stereo Mode
Max power
Stereo Mode
RMS power
Mono mode
RMS power
Stereo Mode
RMS power
Frequency response
Signal-to-noise ratio
Signal-to-noise ratio
Distortion factor (RMS)
Stability
Input sensitivity
Low-pass fi lter
(Low Pass)
High-pass fi lter
(High Pass)
Bass boost
Dimensions
W x H x D (mm)
W x H x D (")
46
2 x 140 W / 4 Ω Fig. 4, 5
1 x 420 W / 4 Ω Fig. 6
2 x 200 W / 2 Ω Fig. 4, 5
2 x 70 W / 4 Ω Fig. 4, 5
1 x 200 W / 4 Ω Fig. 6
2 x 100 W / 2 Ω Fig. 4, 5
10 Hz - 30,000 Hz
> 92 dB @ RMS power
> 75 dB @ 1 W / 1 kHz
< 0.05 %
2 Ω (4 Ω in bridge mode)
0.1 - 8 V
50 - 250 Hz
80 Hz
0 dB to +12 dB
197 x 52 x 296
7.8 x 2.1 x 11.7
Plus / minus connection
– We recommend a minimum cross section of 6 mm
– Route commercially available plus cables to the battery
and connect via fuse holder.
– Use cable glands for holes with sharp edges.
– Securely fasten commercially available minus cables to a
noise-free earth point (chassis screw, chassis metal) (not
to the minus pole of the battery).
– Scrap the contact surfaces of the earth point until they
are bright and grease with graphite grease.
Integrated fuses (Fuse)
The fuses integrated in the amplifi er (Fuse) protect the power
amplifi er and the entire electrical system in case of an error.
If a replacement fuse is used, never bridge fuses or replace
them with a type with higher current.

Connection examples

Connection of the voltage supply ............................... Fig. 2
Connection to car sound system with
cinch output ....................................................................... Fig. 3
Loudspeaker connections ............................................. Fig. 4/5/6
+12V
Remote connection of the amplifi er with switchable +12 V
voltage source.
This allows the amplifi er to be switched on and off using the
on/off -switch of the radio device.

Level control

The Level control is used to adjust the input sensitivity of
the power amplifi er to the output voltage of your car sound
system preamplifi er output.
The adjustment range is from 0.1 V to 8 V.
If a car sound system of a third party manufacturer is con-
nected, the input sensitivity must be adjusted corresponding
to the manufacturer data.
A few important explanations in this context:
By turning the control clockwise, the input sensitivity of the
amplifi er and, therefore, also the volume increases. However,
this is not a volume control; no further amplifi er output
can be achieved in the end position, even if it may sound
like that at the beginning. The system merely increases the
volume faster if the volume control of the car sound system
is turned up.
Loudspeaker connections
(If the amplifi er is to be jumpered, continue with the section
"Bridged loudspeaker connections" at this point).
As with every audio component, the correct polarisation of
amplifi er and loudspeakers is of essentially importance for a
good bass response. For this reason, ensure that the positive
(+) connection of the amplifi er is connected with the posi-
tive connection (+) of the loudspeaker; the same applies to
the negative (-) connections. In addition, the left amplifi er
channel must be connected with the left loudspeaker and
the right amplifi er channel with the right loudspeaker.
2 .