HELIX G FOUR User Manual

15
tected by a further main fuse located close to the
battery (max. distance from battery: 30 cm / 12”).
The HELIX G FOUR is equipped with 2 x 30 Am-
pere fuses.
15
Power & Protect LED
The power and protect LED indicates the operating
mode of the amplier. The LED lights up green
when the amplier is ready for operation. If the LED
lights up red a malfunction has occurred.
A malfunction may have different causes as the
HELIX G FOUR is equipped with different protec-
tion circuits. These protections shut off the ampli-
er in case of overheating, over- and undervoltage,
short-circuit on loudspeakers and false connection.
Please check for connecting failures such as
short-circuits, wrong connections, wrong adjust-
ments and over temperature.
If the amplier does not turn on it is defective and
has to be send to your local authorized dealer for
repair service. A detailed description of the malfunc-
tion and the purchase receipt has to be attached.
16
Output Channels
Speaker outputs of the channels A - D to con-
nect speaker systems. The impedance per chan-
nel should not be lower than 2 Ohms (4 Ohms in
bridged mode).
Installation
Connection of HELIX G FOUR 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-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 car radio. It is not
mandatory to use all pre-amplier inputs. If only
two channels will be connected we recommend
to use the channels A and B and set the Input
Mode switch to “2CH”. When all channels will
be used please choose switch position “4CH”
(see page 13 point 2; Input Mode). The auto-
matic turn-on circuit does not work when using
the pre-amplier inputs. In this case the remote
input (REM) has to be connected to activate the
HELIX G FOUR.
Important: It is strictly forbidden to use the
Highlevel Input and pre-amplier inputs (Line
Input) at the same time. This may cause severe
damage to the pre-amplier 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 channels will be used please choose
switch position “4CH” (see page 13 point 2; In-
put Mode).
Make sure that the polarity is correct. If one
or more connections have reversed polarity it
may affect the performance of the amplier. If
this input is used the remote input (REM) does
not need to be connected as the amplier 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 FOUR to the

HELIX G FOUR Specifications

General

Brand	HELIX
Model	G FOUR
Category	Amplifier
Language	English