HELIX DSP.3S General Instructions Manual page 17

Initial start-up and functions
1 Line Input
6-channel lowlevel line input to connect signal
sources such as head units / radios. Input sensitivity
is factory-set to 4 Volts (maximum CCW position).
It is possible to vary the sensitivity between 2 and
4 Volts using the DSP PC-Tool software (DCM
menu → Signal management). Further information
about adjusting the input sensitivity can be found on
page 19 point 4.
2 Coax Input
Coaxial input in SPDIF format for connecting sourc-
es with a digital audio output. The sampling rate of
this input has to be in the range of 12 and 192 kHz.
The input signal is automatically adapted to the in-
ternal sample rate. In order to control the volume of
this input, we recommend to use an optional remote
control or the WIFI CONTROL.
Note: This signal processor can only handle stereo
input signals and no MP3- or Dolby-coded digital
audio stream!
Note: Before first use, the Coax Input has to be acti-
vated in the DSP PC-Tool software, with an optional
remote control or the WIFI CONTROL. The Optical
Input is activated by default.
Note: It is possible to use the Optical and Coax In-
put at the same time, but switching between these
two inputs requires the optional remote DIRECTOR
or the WIFI CONTROL.
3 Optical Input
Optical input in SPDIF format for connecting signal
sources with a digital audio output. The sampling
rate of this input must be between 12 and 96 kHz.
The input signal is automatically adapted to the in-
ternal sample rate. In order to control the volume of
this input, we recommend to use an optional remote
control or the WIFI CONTROL.
Note: This signal processor can only handle stereo
input signals and no MP3- or Dolby-coded digital
audio stream!
Note: In standard configuration the Optical Input is
activated as well as the manual activation via an
optional remote control is configured.
Note: It is possible to use the Optical and Coax In-
put at the same time, but switching between these
two inputs requires the optional remote DIRECTOR
or CONDUCTOR or the WIFI CONTROL.
4 Highlevel Input
6-channel highlevel loudspeaker input to connect
the signal processor directly to loudspeaker outputs
of OEM / aftermarket radios or OEM amplifiers that
do not have any pre-amplifier outputs. Input sensi-
tivity is factory-set to 11 Volts. It is possible to vary
the sensitivity between 5 and 11 Volts using the
DSP PC-Tool software (DCM menu → Signal man-
agement). Further information about adjusting the
input sensitivity can be found on page 19 point 4.
Attention: Solely use the pluggable screw-terminal
for the highlevel connector which is included in de-
livery!
Important: It is strictly forbidden to use the High-
level and lowlevel Line Input of an individual chan-
nel at the same time as this may cause severe dam-
age to the lowlevel line outputs of your car radio.
Nevertheless it is possible to use the Highlevel In-
put of one channel and the lowlevel Line Input of
another channel simultaneously.
5 Power Input
This input is used for connecting the signal pro-
cessor to the power supply of the vehicle and for
remote in / out. If the highlevel loudspeaker inputs
are used the remote input (Remote in) can be left
unconnected.
The remote output is used for turning on / off ampli-
fiers that are connected to the Line Outputs of the
HELIX DSP.3S. Connect this remote output to the
remote inputs of your amplifier/s. This is essential
to avoid any interfering signals.
The remote output is activated automatically as
soon as the booting process of the DSP is complet-
ed. Additionally this output will be turned off during
the "Power Save Mode" or a software update pro-
cess.
Attention: Solely use the pluggable screw-terminal
which is included in delivery to connect the HELIX
DSP.3S to the power supply!
Important: Never use a different signal than the
remote output of the DSP to activate connected
amplifiers!
6 Ground lift switch
The signal ground of the HELIX DSP.3S is
galvanically decoupled from the power ground. In
many cars this setup is the best way to avoid alter-
nator noise.
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