Installation - HELIX G TWO Manual

Output Channels
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Speaker outputs to connect speaker systems. The
impedance per channel must not be lower than
1 Ohm (2 Ohms in bridged mode).

Installation

Connection of HELIX G TWO 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 11). 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 both pre-amplifier in-
puts. If only one channel will be connected we
recommend to use channel A and set the Input
Mode switch to "1CH". When both channels will
be used please choose switch position "2CH"
(see page 14 point 7; Input Mode). The auto-
matic turn-on circuit does not work when using
the pre-amplifier inputs. In this case the remote
input (REM) has to be connected to activate the
HELIX G TWO.
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:
Channel A = Left
Channel B = Right
Actually it is not mandatory to use both high-
level speaker inputs. If only one channel will be
connected we recommend to use channel A and
set the Input Mode switch to "1CH". When both
channels will be used please choose switch po-
sition "2CH" (see page 14 point 7; Input Mode).
Make sure that the polarity is correct. If one
connection has 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 TWO to the sig-
nal source in order to avoid damage to the
amplifier.
If you want to change the input sensitivity use
the Input Level control (see page 13 point 2; In-
put Level). The settings of the controls affect
both the lowlevel (Line Input) and the highlevel
speaker inputs ( Highlevel Input)! If the High-
level Input is used with a standard car radio we
recommend an input sensitivity of roughly 9
Volts - turn the control 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 1 Ohm
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