Audiotec Fischer HELIX V TWELVE DSP Bedienungsanleitung Seite 32

Installation
After setting the jumpers to the desired plug-in
positions, you can reassemble the amplifier.
To item 2: Now you can optimally adapt the in-
put sensitivity to the connected signal source by
using the Gain control.
Therefore follow the subsequent steps:
1. Don't connect any amplifiers or loudspeakers
to the outputs of the HELIX V TWELVE DSP
during this setup.
2. Turn on the amplifier.
3. Adjust the volume of your radio to approx.
90 % of the max. volume and playback a
1 kHz full scale test tone (0 dB) via CD drive.
4. If the Clipping LED already lights up, you
have to reduce the input sensitivity via Gain
control (page 28, item 10) until the LED
turns off.
5. Increase the input sensitivity by turning the
control clockwise until the LED lights up.
Now turn the control counterclockwise until
the Clipping LED turns off again.
Various adjustment examples of the input sen-
sitivity can be found on page 34. For further ap-
plications please contact your HELIX specialist
dealer.
5. Connection to power supply
Make sure to disconnect the battery before
installing the HELIX V TWELVE DSP!
Connect the +12 V power cable to the positive
terminal of the battery. The positive wire from
the battery to the amplifier power terminals
needs to have an inline fuse at a distance of
less than 12 inches (30 cm) from the battery.
The value of the fuse is calculated from the
maximum total current draw of the whole car
audio system (V TWELVE DSP = max. 60 A
32
RMS at 12 V power supply). If your power wires
are short (less than 1 m / 40") then a wire gauge
of 16 mm² / AWG 6 will be sufficient. In all other
cases we strongly recommend gauges of 25 -
35 mm² / AWG 4 – 2!
The ground cable (same gauge as the +12 V
wire) should be connected to a common ground
reference point (this is located where the neg-
ative terminal of the battery is grounded to the
metal body of the vehicle), or to a prepared
metal location on the vehicle chassis, i.e. an
area which has been cleaned of all paint res-
idues.
6. Connecting the remote input
The remote input (REM) has to be connected to
the radio remote output if the amplifiers lowlevel
Line Inputs or the Optical Input is solely / are
used as signal input/s. We do not recommend
controlling the remote input via the ignition
switch to avoid pop noise during turn on / off.
If the Highlevel Input is used this input does not
need to be connected as long as the car radio
has BTL output stages.
7. Configuration of the remote input
The V TWELVE DSP will be turned on auto-
matically if the Highlevel Input is used or if a
signal is applied to the remote input terminal.
The "Auto Remote" switch allows to deactivate
the automatic turn-on feature of the highlevel
inputs. The feature should be deactivated (Auto
Remote = Off) if there are e.g. noises while
switching on / off the amplifier.
Note: If the automatic turn-on function is deac-
tivated it is mandatory to use the remote input
terminal to power up the amplifier! The highlev-
el signal will be ignored in this case.
Note: The automatic turn-on feature of the
highlevel inputs is activated ex works.
To deactivate the automatic turn-on feature you
have to open the device and change the posi-
tion of the "Auto Remote" switch. Therefore the
device has to be opened as described in item 4
(see marking in the following picture).