Blaupunkt GTA 270 Mystic Manual De Instrucciones página 6

GTA 270 Mystic
Stereo Mode
RMS power
2 x 100 Watt / 2 Ω
Frequency
10 Hz - 30,000 Hz
response
Signal-to-noise ratio
> 92 dB @ RMS power
Signal-to-noise ratio > 75 dB @ 1 W / 1kHz
Distortion factor (RMS) < 0.05%
Stability 2 Ω (4 Ω in bridge mode)
Input sensitivity
0.1–8 V
Low-pass fi lter
(Low Pass) 50-250 Hz
High-pass fi lter
(High Pass) 80 Hz
Bass boost 0 dB to +12 dB
Dimensions
W x H x D (mm) 197 x 52 x 296
W x H x D (") 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 bat-
tery).
- 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
Connection to car sound system with
cinch output
Loudspeaker connections
+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.
6
Level control
The Level control is used to adjust the input sensitivity
Fig. 4, 5
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
connected, the input sensitivity must be adjusted cor-
responding 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 ampli-
fi 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 sec-
tion "Bridged loudspeaker connections" at this point).
As with every audio component, the correct polarisa-
tion 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 positive connection (+) of the
loudspeaker; the same applies to the negative (-) con-
.
2
nections. In addition, the left amplifi er channel must
be connected with the left loudspeaker and the right
amplifi er channel with the right loudspeaker.
Bridged loudspeaker connections
The GTA amplifi er can also be bridged for a mono
confi guration. This allows the amplifi er to be used for
one or several subwoofers or mid-range drivers. In this
confi guration, the amplifi er combines the right and left
channel to a single-channel output (mono output).
Note:
The amplifi er can add the right and left signal informa-
tion only if the right as well as the left RCA connection
were carried out.
Caution:
In a bridge circuit, the amplifi er load must be 4 ohm
or higher. A lower load leads to an overheating or
switch-off of the amplifi er and can cause permanent
Fig. 2
damages.
Fig. 3
Adjusting the type and range of the frequency
Fig. 4/5/6
crossovers
With the GTA 270 Mystic, the type of frequency crosso-
ver (i.e. "Low Pass" or "Hi-Pass") and the desired entry
frequency can be adjusted. For example, if a pair of sub-
woofers is to be connected, the low-pass settings shown
are required (Fig. 3). The entry frequency is dependent
upon the frequency range of the loudspeakers (see rec-
ommended frequency range of the loudspeakers).