14
Initial start-up and functions
Caution:
To avoid a loss of gain make sure that
the crossover frequencies of the high- and lowpass
filters do have an interval of at least two octaves
when generating a bandpass.
That means if the lowpass signal is adjusted to
320 Hz the highpass should be adjusted to 80 Hz
or less (one octave = doubled frequency or halved
frequency).
If a subwoofer is connected we recommend to use
the highpass control (3) as variable low-frequency
highpass filter or turn it counterclockwise to 15 Hz
to get a subsonic filter.
7
Input Mode
This switch is used to route the input signals to the
respective amplifier channels.
2-channel mode: If the head unit / car radio provides
one stereo output, all speaker outputs are supplied
with the corresponding input signal.
1-channel mode: If only the RCA / Cinch resp. high-
level input of channel A is connected, both amplifier
channels are supplied with this signal. In this mode
the input signal of channel A is routed to channel B.
Please consider that the fader- and balance control
of the head unit have the same effect on channel B
as on channel A.
8
Bass Boost
This control is used to increase the bass response
at a center frequency of 45 Hz from 0 to 12 dB.
9
Remote
This input is used to connect the included remote
control. The remote control allows you to control the
volume of the amplifier in stereo and bridged mode.
Note:
Volume control via remote control is only ac-
tivated in bandpass mode.
10
Line Out
2-channel pre-amplifier output for connecting exter
-
nal amplifiers. The output voltage is 6 Volts max.
11
GND
The ground cable should be connected to a com-
mon ground reference point (this is located where
the negative terminal of the battery is grounded
to the metal body of the vehicle) or to a prepared
metal location on the vehicle chassis i.e. an area
which has been cleaned of all paint residues. Rec-
ommended cross section: min. 16 mm² / AWG 6.
12
REM
The remote lead should be connected to the remote
output / automatic antenna (aerial positive) output
of the head unit / car radio. This is only activated
if the head unit is switched on. Thus the amplifier
is switched on and off together with the head unit.
This input needn’t to be assigned if the
Highlevel
Input
is used.
13
+12 V
Connect the +12 V power cable to the positive ter-
minal of the battery. Recommended cross section:
min. 16 mm² / AWG 6.
14
Fuse
The input fuses are connected in parallel and pro-
vide protection against an internal fault of the de-
vice, therefore the system must be additionally pro-
tected by a further main fuse located close to the
battery (max. distance from battery: 30 cm / 12”).
The HELIX G TWO is equipped with 2 x 30 Ampere
fuses.
15
Power & Protect LED
The power and protect LED indicates the operating
mode of the amplifier. The LED lights up green
when the amplifier is ready for operation. If the LED
lights up red a malfunction has occurred.
A malfunction may have different causes as the
HELIX G TWO is equipped with different protec-
tion circuits. These protections shut off the amplifi
-
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 amplifier 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.
