17
Installation
Connection of HELIX G FIVE 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 12). 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. It is
not mandatory to use all pre-amplifier inputs. If
only two channels will be connected we recom-
mend to use the channels A and B and set the
Input Mode
switch to “2CH”. When operating
with four signal inputs please use channel A to
D and choose switch position “4CH”.
If all six channels will be used choose switch
position “5CH” (see page 14 point 2;
Input
Mode
). The automatic turn-on circuit does not
work when using the pre-amplifier inputs. In this
case the remote input (
REM
) has to be connect-
ed to activate the HELIX G FIVE.
Important:
It is strictly forbidden to use the
Highlevel Input
and pre-amplifier inputs (
Line
Input
) of the channels A to D at the same time.
This may cause severe damage to the pre-am-
plifier 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:
Channel A = Front left
Channel B = Front right
Channel C = Rear left
Channel D = Rear right
Actually it is not mandatory to use all highlevel
speaker inputs. If only two channels will be con-
nected we recommend to use the channels A
and B and set the
Input Mode
switch to “2CH”.
When all four channels will be used please
choose switch position “4CH” (see page 14
point 2;
Input Mode
).
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 applied.
3. Adjustment of the input sensitivity
Attention:
It is mandatory to properly adapt
the input sensitivity of the G FIVE to the
signal source in order to avoid damage to
the amplifier.
If you want to change the input sensitivity of the
channel pairs use the three
Input Level
controls
(see page 14 point 4;
Input Level
). The settings
of the controls affect both the lowlevel (
Line
Input
) and the highlevel speaker inputs
(
Highlevel Input
)! If the
Highlevel Input
is used
with a standard car radio we recommend an
input sensitivity of roughly 9 Volts - turn the con-
trol from min position to 1/3 position - 11 o’clock
position.
4. Connecting the loudspeaker outputs
The loudspeaker outputs can be connected
directly to the wires of the loudspeakers. Never
connect any of the loudspeaker cables with the
chassis ground as this will damage your ampli-
fier and your speakers.
Ensure that the loudspeakers are correctly con-
nected (in phase), i.e. plus to plus and minus
to minus. Exchanging plus and minus causes
a total loss of bass reproduction. The plus pole
is indicated on most speakers. The impedance
of each channel must not be less than 2 Ohms
(4 Ohms channels A to D in bridged mode),
otherwise the amplifier protection will be acti
-
vated. We solely recommend to connect a sub-
woofer to the speaker outputs “SUB” as this has
been specially developed for it.
Examples of speaker configurations can be
found on page 19 - 20.
