Installation
Connection of HELIX V EIGHT 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 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 car radio. Each
input can be assigned to any output using the
DSP PC-Tool software. The automatic turn-on
circuit does not work when using the pre-ampli-
fier inputs. In this case the remote input (
REM
)
has to be connected to activate the HELIX
V EIGHT DSP.
Important:
It is strictly forbidden to use the
Highlevel Input
and pre-amplifier inputs (
Line
Input
) at the same time. This may cause severe
damage to the pre-amplifier outputs of your car
radio.
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 amplifier:
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 (
REM
) does
not need to be connected as the amplifier will
automatically turn on once a loudspeaker signal
is received.
3. Adjustment of the input sensitivity
Attention:
It is mandatory to properly adapt
the input sensitivity of the V EIGHT DSP to
the signal source in order to avoid damage
to the amplifier.
Several adjustment examples are listed in the
table on page 22.
If you want to change the input sensitivity use
the control 9 (see page 18 point 9;
Input Sen
sitivity
) at first. The setting of the control affects
both the lowlevel and the highlevel inputs!
If the ex factory sensitivity range of the low
-
level input (2 - 4 Volts) resp. highlevel input
(5 - 10 Volts) may not be sufficient it is pos
-
sible to change it internally by repositioning
jumpers. Therefore dismantle the side panel
(where the USB input is located) by removing
the four screws (two Philipps head screws and
two allen head screws). Now you can pull out
the bottom plate and get access to the jumpers.
The long jumper (
Jumper A
, 16-pins) affects the
channels A - D and the short jumper (
Jumper B
,
8-pins) the channels E and F. Inside the device
there are two plug positions for each Jumper.
The different plug positions are explained in the
following:
Overview plug-in positions:
Jumper A
Jumper B
A2
B1
A1
B2
19
