13
Initial start-up and functions
1
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 Input
and lowlevel
Line Input
at the same time.
This may cause severe damage to the lowlevel line
outputs of your head unit / car radio.
2
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 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!
Important:
It is strictly forbidden to use the
High
level Input
and lowlevel
Line Input
at the same time.
This may cause severe damage to the lowlevel line
outputs of your car radio.
3
Level Input
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
(lowlevel) is 0.5 - 6 Volts and 1.1 - 13 Volts for
the
Highlevel 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
control from max. CCW position to 9 o’clock posi
-
tion.
4
Subsonic
This control is used to adjust the crossover
frequency of the subsonic filter from 10 Hz to 50 Hz.
The subsonic filter cuts off very low frequencies
which aren’t audible and therefore relieves the am
-
plifier and also the subwoofer. Additionally the am
-
plifier will have more power available for the audible
frequencies. This control is always activated and its
adjustment is mandatory.
5
Lowpass
This control is used to adjust the crossover frequen
-
cy of the lowpass filter from 50 Hz 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 4) and lowpass filter (con
-
trol 5) 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 is adjusted to 100 Hz the subsonic should
be adjusted to 25 Hz or less (one octave = doubled
frequency or halved frequency).
6
Phase Shift
This control is used to adjust the phase from 0° to
180°. This allows to match the phase of the sub
-
woofer with the other speakers thus avoiding any
cancellations in the frequency response due to
phase shifts.
