14
Initial start-up and functions
1
Input Sensitivity
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 2 - 6 Volts and 4 - 11 Volts for the
High-
level 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 max. CCW position to
8 o’clock position.
2
X-Over Frequency
This control is used to adjust the crossover
frequency of the highpass or lowpass filter (depend
-
ing on the position of the
X-Over
switch) from 15 Hz
bis 150 Hz.
Note:
To deactivate the filters of the M 2FX set the
X-Over
switch to HPF and the
X-Over Frequency
control to 15 Hz. This should be done if filter ad
-
justments are made in a DSP / DSP-amplifier
connected upstream.
3
Line Input
3.5 mm stereo 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
Line Input
at the same time. This
may cause severe damage to the pre-amplifier out
-
puts of your head unit / car radio.
4
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-termi-
nal for the highlevel connector which is included in
delivery.
Important:
It is strictly forbidden to use the
High-
level Input
and
Line Input
at the same time. This
may cause severe damage to the pre-amplifier out
-
puts of your car radio.
5
X-Over
This switch allows to set the internal crossover to
highpass or lowpass.
If the
X-Over
switch is set to HPF (highpass filter)
the crossover frequency for the highpass can be ad-
justed with control 2 (
X-Over Frequency
).
At switch position LPF (lowpass filter) the crossover
frequency for the lowpass can be adjusted with con-
trol 2 (
X-Over Frequency
).
Note:
To deactivate the filters of the M 2FX set the
X-Over
switch to HPF and the
X-Over Frequency
control to 15 Hz. This should be done if filter
adjustments are made in a DSP / DSP-amplifier
connected upstream.
6
Speaker Output
Speaker outputs to connect speaker systems. The
impedance per channel must not be lower than
2 Ohms. The speaker outputs are not bridgeable.
7
Input Mode
This switch is used to route the input signals to the
respective amplifier channels.
