14
Initial start-up and functions
9
Subsonic
This control is used to adjust the crossover fre-
quency of the subsonic filter from 10 to 50 Hz. The
subsonic filter cuts off very low frequencies which
are not in the audible range and relives the amplifi
-
er and the subwoofer. Additionally the amplifier will
have more power available for the audible frequen-
cies. This control is always activated and its adjust-
ment is mandatory.
10
LPF
This control is used to adjust the crossover fre-
quency of the lowpass filter from 50 to 250 Hz. This
control is always activated and its adjustment is
mandatory.
In combination with the subsonic filter, the lowpass
-
filter creates a bandpass in any case. By adjusting
the subsonic (control 9) and lowpass (control 10)
filter any bandpass between 10 Hz and 250 Hz can
be realized.
Caution:
To avoid a loss of gain make sure that the
crossover frequencies of the subsonic 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
100 Hz the highpass should be adjusted to 25 Hz
or less (one octave = doubled frequency or halved
frequency).
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 ONE is equipped with 3 x 40 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 ONE is equipped with different protection
circuits. These protections shut off the amplifier
