HELIX P TWO Manual page 15

Initial start-up and functions
1 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 low-
level line outputs. The Highlevel Input is equipped
with our proprietary ADEP circuit (Advanced Diag-
nostics Error Protection) 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 am-
plifier 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!
Important: It is strictly forbidden to use the High-
level and lowlevel Line Input of an individual chan-
nel at the same time as this may cause severe
damage to the lowlevel line outputs of your car ra-
dio. Nevertheless it is possible to use the Highlevel
Input of one channel and the lowlevel Line Input of
another channel simultaneously.
2 Line Input
2-channel lowlevel line input to connect signal
sourc es such as head units / radios / DSPs.
Important: It is strictly forbidden to use the High-
level and lowlevel Line Input of an individual chan-
nel at the same time as this may cause severe
damage to the lowlevel line outputs of your car ra-
dio. Nevertheless it is possible to use the Highlevel
Input of one channel and the lowlevel Line Input of
another channel simultaneously.
3 Clipping LED
This LED lights up red if one of the Highlevel Inputs,
lowlevel Line Inputs or the Optical Input is overdriv-
en. If this LED lights up reduce the input sensitivity
by using the control 4 (Gain) until the LED goes out.
4 Gain
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 lowlevel
Line Input is 2 - 8 Volts, 5 - 20 Volts for the Highlevel
Input and 0 - 12 dB for the Optical Input.
If the Highlevel Input is used in combination with a
standard car radio we recommend an input sensitiv-
ity of roughly 9 Volts. For this purpose, turn the con-
trol from max. CCW position to 9 o'clock position.
5 Remote
This input is used to connect the included remote
control. The remote control allows you to control the
volume of the amplifier.
Note: Volume control via remote control is only ac-
tivated in bandpass mode.
6 HPF Frequency
This control is used to adjust the crossover
frequency of the highpass filter from 15 Hz to
4,000 Hz. This control is activated if the X-Over
switch is set to HPF (highpass filter) or BPF (band-
pass) and its adjustment is mandatory.
7 X-Over
This switch allows to set the internal crossover to
highpass, fullrange or bandpass mode.
If the X-Over switch is set to HPF (highpass filter)
the crossover frequency for the highpass can be ad-
justed with control 6. At switch position FULL (full-
range) the crossover is bypassed.
At switch position BPF (lowpass filter) the highpass
is always active. That means a bandpass is created
in any case.
By adjusting the highpass (control 6) and lowpass
(control 8) filter any bandpass between 15 Hz and
4,000 Hz can be realized.
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