HELIX DSP PRO MK3 User Manual page 22

Hardware configuration
device (see page 21, point 2).
Attention: Solely use the pluggable screw-ter-
minal for the highlevel connector which is in-
cluded 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.
5. Connecting a digital signal source
If you have a signal source with a coaxial or
optical digi tal output you can connect it to the
signal processor 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 auto-
matically 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 DSP PRO MK3 and your connect-
ed amplifiers. This may cause severe damage
to your speakers. We strongly recommend to
use an optional remote control for adjusting
the volume level of the digital signal inputs!
Note: The HELIX DSP PRO MK3 can only
handle uncompressed digital stereo signals
in PCM format with a sample rate between
12 kHz and 96 kHz / 192 kHz and no MP3- or
Dolby-coded digital audio stream!
6. Configuration of the remote input
The DSP PRO MK3 will be turned on auto-
matically if the Highlevel Input is used or if a
signal is applied to the remote input terminal.
The Auto Remote switch
22
(page 19, point 4) al-
lows to deactivate the automatic turn-on fea-
ture of the highlevel inputs. The feature should
be deactivated if there are e.g. noises while
switching on / off the signal processor.
On: Activation via highlevel speaker input is
enabled (by default).
Off: Activation via highlevel speaker input is
disabled.
Note: If the automatic turn-on function is de-
activated it is mandatory to use the remote
input terminal to power up the signal proces-
sor! The highlevel signal will be ignored in this
case.
7. Connection to power supply & remote
Make sure to disconnect the battery before
installing the HELIX DSP PRO MK3!
Solely use the included screw-type terminal to
connect the HELIX DSP PRO MK3 to a power
supply. Make sure of correct polarity.
+: Connector for the +12 V power cable. The
positive wire has to be connected to the bat-
tery's positive post or a power distribution
block. Though the current draw of the HELIX
DSP PRO MK3 is rather low (approx. 650 mA)
we recommend a minimum wire gauge of
1 mm² / AWG18.
–: Connector for the ground cable. The ground
wire must be connected to the vehicle chas-
sis at a non-insulated point. The cable should
have the same gauge as the +12 V wire. Inad-
equate grounding causes audible interference
and malfunctions.
Remote in: The remote input is used to switch
on the DSP PRO MK3 if the pre-amplifier or
digital inputs are used. Additionally, this input
must be assigned, if the signal source which
is connected to the Highlevel Input is not acti-
vating the "automatic turn-on" function or if the
signal processor shall only be activated / de-
activated via a remote signal. The remote wire
should be connected to the remote output /
automatic antenna (aerial positive) output of
the head unit / car radio. This is only activated
if the head unit is switched on. Thus the signal
processor is switched on and off together with
the head unit.
We do not recommend controlling the remote
input via the ignition switch to avoid pop noise
during turn on / off.