Audiotec Fischer HELIX G FIVE Handbuch Seite 14

Initial start-up and functions
1 Line Input
6-channel pre-amplifier input to connect signal
sourc es such as head units / radios / DSPs. Please
consider that a sum signal for the subwoofer chan-
nel is generated by the last two signal inputs (SUB-L
and SUB-R).
Important: It is strictly forbidden to use the High-
level Input and pre-amplifier inputs (Line Input) of
the channels A to D at the same time. This may
cause severe damage to the pre-amplifier outputs
of your head unit / car radio.
2 Input Mode
This switch is used to route the input signals to the
respective amplifier channels.
5-channel mode: In this mode all RCA inputs must
be connected. As the subwoofer channel has a ste-
reo input, both should be used. In case only one
input is connected, the input sensitivity (Input Level)
must be adjusted.
Note: When using the Highlevel Input in the 5-chan-
nel mode, at least one of the subwoofer RCA input
channels (SUB-L or SUB-R) has to be connected.
4-channel mode: If the head unit / car radio provides
two stereo outputs, the four speaker outputs A to
D are supplied with the corresponding input signal.
The subwoofer output is supplied by a sum signal of
the four input signals A, B, C and D.
2-channel mode: If the head unit / car radio only
provides one stereo output, all amplifier channels
are supplied with this signal. This means, that only
the RCA / highlevel inputs of the channels A and B
need to be connected. In this mode the input signal
of channel A is routed to channel C and channel B
is routed to channel D. For the subwoofer channel
(SUB) a sum signal is generated by the input sig-
nals of the channels A and B.
Please consider that the fader and balance control
of the head unit have the same effect on channels
C and D as on channels A and B.
3 Highlevel Input
4-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
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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! When using the
highlevel signal input, we recommend using the
4-channel mode (see point 2; Input Mode).
Important: It is strictly forbidden to use the High-
level Input and pre-amplifier inputs (Line Input) of
the channels A to D at the same time. This may
cause severe damage to the pre-amplifier outputs
of your car radio.
4 Input Level
These controls are used to adapt the input sensitiv-
ity of the channel pairs A/B resp. C/D as well as of
the subwoofer channel to the output voltage of the
connected signal source. These controls are not
volume controls, they are only for adjusting the am-
plifier gain. The control range of the RCA / Line In-
put 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.
5 HPF
This control is used to adjust the crossover frequen-
cy of the highpass filter from 15 Hz bis 4,000 Hz.
This control is activated if the X-Over switch of the
specific channel pair is set to HPF (highpass filter).
On channel pair C/D it is also activated in LPF /
Bandpass and its adjustment is mandatory.