HELIX ULTIMATE P SIX DSP User Manual page 20

Hardware configuration
After setting the jumpers to the desired plug-in
positions, you can reassemble the amplifier.
2. Connecting the pre-amplifier inputs
These six lowlevel line inputs can be connect-
ed to signal sources such as head units / ra-
dios using appropriate cables. Each input can
be assigned to any output using the DSP PC-
Tool software. Input sensitivity is factory-set
to 4 Volts for all channels. But it is possible
to optimally adapt the input sensitivity to the
signal source (see page 22, point 8).
The automatic turn-on circuit does not work
when using the pre-amplifier inputs. In this
case the remote input has to be connected to
activate the HELIX P SIX DSP ULTIMATE.
Important: It is strictly forbidden to use the
Highlevel and lowlevel Line Input of an indi-
vidual channel at the same time as this may
cause severe damage to the lowlevel line out-
puts of your head unit / car radio. Neverthe-
less it is possible to use the Highlevel Input
of one channel and the lowlevel Line Input of
another channel simultaneously.
3. Connecting the highlevel speaker inputs
The six highlevel loudspeaker inputs can be
connected directly to the loudspeaker out-
puts of an OEM, aftermarket radio or factory
installed amplifier using appropriate cables
(loudspeaker cables with 1 mm² / AWG 18
max.).
We recommend the following channel assign-
ment if a common car radio will be connected
to the amplifier:
Channel A = Front left
Channel B = Front right
Channel C = Rear left
Channel D = Rear right
Actually it is not mandatory to use all high level
speaker inputs. If only two channels will be
connected we recommend to use the chan-
nels A and B. Make sure that the polarity is
correct. If one or more connections have re-
versed polarity it may affect the performance
of the amplifier. If this input is used the remote
input does not need to be connected as the
amplifier will automatically turn on once a
loudspeaker signal is received.
Input sensitivity is factory-set to 16 Volts for
20
all channels. It is possible to optimally adapt
the input sensitivity to the signal source (see
page 22, point 8).
Attention: Solely use the pluggable screw-ter-
minals for the highlevel connector which are
included in delivery!
Important: It is strictly forbidden to use the
High level and lowlevel Line Input of an indi-
vidual channel at the same time as this may
cause severe damage to the lowlevel line out-
puts of your car radio.
Nevertheless it is possible to use the Highlevel
Input of one channel and the lowlevel Line In-
put of another channel simultaneously.
4. Connecting a digital signal source in
SPDIF format
If you have a signal source with a coaxial or
optical digi tal output you can connect it to
the amplifier using the appropriate input. The
sampling rate must be between 12 and 96 kHz
for the Optical Input and 12 - 192 kHz for the
Coax Input. The input signal is automatically
adapted to the internal sample rate.
In standard configuration the Optical Input is
activated as well as the manual activation via
an optional remote control is configured.
Alternatively you can activate the automatic
turn-on feature in the DCM menu of the DSP
PC-Tool software.
The automatic turn-on circuit does not work
when a digital input is used. Therefore it is
mandatory to connect the remote input.
Important: The signal of a digital audio
source normally does not contain any infor-
mation about the volume level. Keep in mind
that this will lead to full level on the outputs
of the HELIX P SIX DSP ULTIMATE and your
connected amplifiers. This may cause severe
damage to your speakers. We strongly rec-
ommend to use an optional remote control for
adjusting the volume level of the digital signal
input!
Note: The HELIX P SIX DSP ULTIMATE can
only handle uncompressed digital stereo
signals in PCM format with a sample rate be-
tween 12 kHz and 96 kHz / 192 kHz and no
MP3- or Dolby-coded digital audio stream!