Audiotec Fischer HELIX DSP MINI Manual page 16

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 (maximum CCW position).
It is possible to vary the sensitivity between 2 and
4 Volts.
2 Clipping LED
This LED lights up red if one of the four lowlevel
Line Inputs or Highlevel Inputs is overdriven. The
LED has no function if the device is fed with digital
input signals. If this LED lights up reduce the input
sensitivity by using the control 4 (Input Sensitivity)
until the LED goes out.
3 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 (maximum CCW posi-
tion). It is possible to vary the sensitivity between 5
and 11 Volts with control 4 (Input Sensitivity).
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.
4 Input Sensitivity
This control is used to adapt the input sensitivity of
the low- and highlevel inputs to the output voltage
of the connected signal source. This is not a volume
control, it´s only for adjusting the signal processors
gain. Adjustments with this control do not affect
the optical input! The control range of the lowlevel
RCA / Line Input is 2 - 4 Volts and 5 - 11 Volts for
the Highlevel Input.
Attention: It is mandatory to properly adapt the in-
put sensitivity of the DSP MINI to the signal source
in order to avoid damage to the signal processor.
Note: The input sensitivity ex works is set to max.
CCW position. This is definitely the best setting for
most applications.
16
5 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.
Note: This signal processor can only handle stereo
input signals and no MP3- or Dolby-coded digital
audio stream!
Note: It is possible to use the Optical Input and the
Highlevel Input or lowlevel Line Input at the same
time.
6 Auto Remote
The DSP MINI 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 ex works (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.
7 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 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 MINI. 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!
Important: Never use a different signal than the