13
Initial start-up and functions
1
Line Input
2-channel pre-amplifier input to connect signal
sourc es such as head units / radios / DSPs.
Important:
It is strictly forbidden to use the
High
level Input
and pre-amplifier inputs (
Line Input
) at
the same time. This may cause severe damage to
the pre-amplifier outputs of your head unit / car ra
-
dio.
2
Input Level
This control is used to adapt the input sensitivity to
the output voltage of the connected signal source.
This is not a volume control, it´s only for adjusting
the amplifier gain. The control range of the RCA /
Line Input
is 1 - 6 Volts and 2.5 - 14 Volts for the
Highlevel Input
.
If the
Highlevel 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.
3
Highlevel Input
2-channel highlevel loudspeaker input to connect
the amplifier directly to the loudspeaker outputs
of OEM / aftermarket radios that do not have any
pre-amplifier outputs.
The
Highlevel Input
is equipped with our proprietary
ADEP circuit (Advanced Diagnostics Error Protec-
tion) which ensures that the car radio detects the
amplifier as a speaker and thus neither any function
of the radio (e.g. fader) will be deactivated nor any
error log in the CPU of the car will be created.
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.
Attention:
Solely use the pluggable screw-terminal
for the highlevel connector which is included in de-
livery or an optional available cable harness from
the HELIX accessory assortment!
Important:
It is strictly forbidden to use the
High
level 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.
4
Phase
This control is used to adjust the phase from 0° to
180°. This allows to match the frequency response
from the subwoofer to the other speaker systems
and ensures that there are no frequency elimina-
tions.
5
Remote
This input is used to connect the included remote
control. The remote control allows you to control the
volume of the amplifier.
6
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
a stereo output an optimized sum signal is generat-
ed out of the two input signals A and B. In case both
RCA / highlevel inputs need to be connected.
1-channel mode: If the head unit / car radio provides
a mono output for subwoofer applications, only the
RCA / Cinch resp. highlevel input of channel A
needs to be connected.
7
Bass Boost
This control is used to increase the adjusted bass
center frequency (see point 8) from 0 to 12 dB.
8
Bass Frequency
This control is used to adjust the center frequency
of the
Bass Boost
from 25 Hz to 50 Hz. The ad-
justed bass frequency can be enhanced from 0 to
12 dB with control 7.
This is useful to emphasize or correct a determined
frequency of the subwoofer (kickbass).
