HELIX DSP MINI MK2 Manual page 18

Initial start-up and functions
1 Line Input
4-channel lowlevel line input to connect signal
sourc es such as head units / radios. Input sensitivity
is factory-set to 4 Volts.
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 20 point 4.
2 Highlevel Input
4-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 management). Further information
about adjusting the input sensitivity can be found on
page 20 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.
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 rec-
ommend 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 manual activa-
tion via an optional remote control is configured.
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4 Auto Remote
The DSP MINI MK2 will be turned on automatically
if the Highlevel Input is used or if a signal is applied
to the remote input (Remote in) terminal.
The Auto Remote switch allows to activate / deac-
tivate the automatic turn-on feature of the highlevel
inputs. The feature should be deactivated (Auto Re-
mote = Off) if there are e.g. disturbing noises while
switching on / off the signal processor.
Note: The automatic turn-on feature of the highlevel
inputs is activated by default (Auto Remote = On).
Note: If the automatic turn-on function is deactivat-
ed it is mandatory to use the remote input to power
up the signal processor! The highlevel signal will be
ignored in this case.
5 Power Input
This input is used for connecting the signal proces-
sor to the power supply of the vehicle and for re-
mote in / out. If the highlevel loudspeaker inputs are
used the remote input can be left unconnected. The
remote output is used for turning on / off amplifiers
that are connected to the Line Outputs of the HELIX
DSP MINI MK2. 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 MINI MK2 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 MINI MK2 is
galvanically decoupled from the power ground. In
many cars this setup is the best way to avoid al-
ternator noise. Nevertheless, there are use cases
where it will be necessary to directly connect input
and output ground or to tie both grounds together
via a resistor. Therefore the Ground lift switch has
three positions:
- center position: input
separated.
and output ground