12
A
C
D
B
Pin assignment
for subwoofer
(Connector B)
The Connection cable with a
lenght of 5m (2x1,5mm²) is
available as original HELIX-
accessory.
HELIX Art.-Nr.: H424900
green
= plus (+)
purple-black = minus (-)
Connection of a passive subwoofer to the PP20/AUX
Fig.1
Fig.2
1
Mode Select
The PP20/AUX has three connecting modes which
can be chosen by using this switch:
1.1 Linear
The PP20/AUX is connected to the front- and rear-
loudspeakers. In this mode all loudspeakers are
driven in a linear mode, this means without any
filters.
1.2 Highpass
The PP20/AUX is connected to the front- and
rear-loudspeakers. In this mode all loudspeakers
are driven with a highpass signal of 80Hz 18dB/
oct. This mode works as protection against low
frequencies below 80Hz for loudspeakers of the
original factory system with only little power. You
can do without this mode if you replace the lou-
dspeakers of the factory system by high quality
HELIX- loud-speakers
.
1.3 3-Channel
In this mode the PP20/AUX works as a 3-Chan-
nel-Amplifier, i.e. the front loudspeakers are driven
via the two channels FR and FL. The two channels
for the rear loudspeakers RR and RL are bridged
and form a mono signal for connecting a passive
subwoofer. To do so, it is mandatory to disconnect
the
connection A/B
. The rear loudspeakers are
now decoupled from the PP20/AUX. The
connec-
tor B
now carries the subwoofer signal. By brid-
ging the two channels output power will increase
to 85/170 Watts RMS/Music. Moreover, the front
loudspeakers are driven with a highpass signal
of 80Hz 18dB/oct. The connection of the passive
subwoofer works with the following technical data:
Subsonic filter: 25Hz 18dB/oct. • Lowpass: 115
Hz 18dB/oct. • Bassboost: +3dB bei 45Hz.
Your passive subwoofer must at least have an
impedance of 4 Ohms! If you fall below this im-
pedace the operating safety of the PP20/AUX
can not be guaranteed. If necessary, contact
your dealer for further information.
By disconnecting the connection A/B, the rear
loudspeakers (if part of your factory system) are
no longer connected to the system. In order to
reactivate them in the 3-channel mode, you can
make use of the original radio signal. Please pre-
cede as follows:
Disconnect the
connection C/D
and
connect the
connectors A and C.
Thus, the radio output signal
is directly transmitted to the rear loudspeakers.
Initial start-up and functions
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