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Introduction
Congratulations on your purchase of a high-quality MPA power
amplifier. By selecting the MPA 400, you have chosen a product
which delivers superlative reproduction quality. Whether you are
upgrading an existing system or using the MPA power amplifier in
a new system, you are certain to notice immediate performance
benefits!
Recommendation:
A power amplifier's performance is only as good as its installation. Pro-
per installation will maximise the overall performance of your audio sy-
stem. 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
damage 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 vehic-
le 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 damage to vehicle components
(battery, cables, fuse boxes).
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, and provide suf-
ficient ventilation for cooling of the amplifier. Use cable grommets when
passing cables through holes with sharp edges. Use loudspeakers with
an impedance of 2 to 4 Ω. Observe the max. power handling specifica-
tions (music output). Do not connect the loudspeakers to ground; only
use the terminals provided. The cross-section of the positive and nega-
tive cable must be at least 6 mm
MPA 400 amplifier
The amplifier is suitable for connection to car radios with Cinch
connector.Use the Blaupunkt ISO Cinch adapter to connect the ampli-
fier to car radios with ISO connector. (7 607 893 093 / 7 607 855 094)
2 Ohm stable 3/2 channel power amplifier
2 x 80 + 1 x 200/ 2 x 200 Watts
3-channel Class A/B amplifier
Can be bridged from 3-channel to 2-channel mode
Max. power
RMS power
Frequency response
Signal-to-noise ratio
Crosstalk attenuation
Gain control
Low-pass filter, variable
High-pass filter, variable
Inputs
Outputs
Dimensions (WxHxD)
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 nega-
tive battery pole. Clean the contact surface of the ground point down to
bare metal and coat with antiseize graphite petroleum.
2
.
2 x 80 +1 x 200 W or 2 x 200 W into 4 Ω
2 x 30 +1 x 100 W at 0.1% THD
2 x 100 W at 0.25% THD
20-50 kHz
> 90 dB full rated power
>100 dB (1 kHz)
0.3-4V
50-250 Hz
50-500 Hz
3 Cinch, RCA gold-plated and
high-level input
3 loudspeakers, 4 Ω
220 x 57 x 300
2
. Run a
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 to car radios with ISO terminal using the
Cinch jack .................................................................................... Fig. 3
Connection to car radios with Cinch output ................................. Fig. 4
Connection to car radios with loudspeaker output ....................... Fig. 5
Car radios with 20-pole connector systemuse adapter
cable 7 607 893 093 .................................................................... Fig. 6
Loudspeaker connections ................................................... Figs. 7- 10
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.
High-level inputs
The amplifier is equipped with high-level inputs to permit connection to
radios without preamp outputs (Fig. 5, 5a). This enables direct connec-
tion to be made to the radio's loudspeaker output.
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 ran-
ge of adjustment extends from 0.3 V to 4 V. The control is preset to 2 V
for Blaupunkt car radios.
Adjust the input sensitivity in accordance with the manufacturer's speci-
fications 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 volu-
me 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. 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.
Bridged loudspeaker connections
The MPA 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 spea-
ker. 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.
MPA 400
The type of crossover (i.e. "low-pass" or "hi-pass") and the desired cros-
sover frequency can be selected on the MPA 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 loudspea-
ker 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. Example: at a set-
ting of 250 Hz, the loudspeaker has a frequency range of 250 Hz to
20 kHz.
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8 622 401 300
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