HELIX M FOUR DSP - Installation; Connecting Pre-Amplifier Inputs; Connecting Highlevel Speaker Inputs; Connecting a Digital Signal Source

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Installation
Connection of HELIX M FOUR DSP 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 23). It is recommended that this unit will be
installed by an authorized HELIX dealer.
1. Connecting the pre-amplier inputs
Use the correct cable (RCA / cinch cable) to
connect these inputs to the pre-amplier /
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-amplier inputs. In this case the remote in-
put has to be connected to activate the HELIX
M FOUR DSP.
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 a󰀨ect the performance of the amplier.
If this input is used the remote input does not
need to be connected as the amplier 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 amplier
using the appropriate input. In standard con-
guration the manual activation via an optional
remote control is congured.
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
Fig. 1: Line Output connection cable