28
Installation
Connection of HELIX V EIGHT DSP MK2 to the
head unit / car radio:
Caution:
Carrying out the following steps will re-
quire special tools and technical knowledge. In or-
der to avoid connection mistakes and / or damage,
ask your dealer for assistance if you have any ques-
tions and follow all instructions in this manual (see
page 15). It is recommended that this unit will be
installed by an authorized HELIX dealer.
1. Connecting the pre-amplifier inputs
Use the correct cable (RCA / cinch cable) to
connect these inputs to the pre-amplifier /
lowlev el / cinch outputs of your head unit / car
radio. Each input can be assigned to any output
using the DSP PC-Tool software. The automat-
ic turn-on circuit does not work when using the
pre-amplifier inputs. In this case the remote in
-
put has to be connected to activate the HELIX
V EIGHT DSP MK2.
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. Nevertheless
it is possible to use the
Highlevel Input
of one
channel and the lowlevel
Line Input
of another
channel simultaneously.
2. Connecting the highlevel speaker inputs
The highlevel loudspeaker inputs can be con-
nected directly to the loudspeaker outputs of an
OEM or aftermarket radio using appropriate ca-
bles (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 signal processor:
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 con-
nected we recommend to use the channels A
and B. Make sure that the polarity is correct. If
one or more connections have reversed 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 au
-
tomatically turn on once a loudspeaker signal
is received.
3. Connecting a digital signal source
If you have a signal source with an optical digi-
tal output you can connect it to the amplifier
using the appropriate input. In standard con-
figuration 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 feature activates the
digital input as soon as a digital audio signal is
detected.
The automatic turn-on circuit does not work
when a digital input is used. Therefore it is man-
datory to connect the remote input (
REM
).
Important:
The signal of a digital audio source
normally does not contain any information
about the volume level. Keep in mind that
this will lead to full level on the outputs of the
HELIX V EIGHT DSP MK2 and your connected
amplifiers. This may cause severe damage to
your speakers. We strongly recommend to use
an optional remote control for adjusting the vol-
ume level of the digital signal input!
Information:
The HELIX V EIGHT DSP MK2
can only handle uncompressed digital stereo
signals in PCM format with a sample rate be-
tween 12 kHz and 96 kHz and no MP3- or Dol-
by-coded digital audio stream!
4. Signal configuration
The factory setting of the input sensitivity as
well as the load of the highlevel inputs of the
V EIGHT DSP MK2 are appropriate for the
most common radios. As soon as the connect-
ed signal source provides an input voltage be-
tween 11 V and 32 V – e.g. if an OEM amplifier
is used as signal source – please follow the
subsequent steps 4.1 and 4.2. If you are not
sure regarding the signal sources output volt-
age, please contact your HELIX specialist deal-
er.
