30
Jumper positions for extended adjustment range:
Value range:
Highlevel 8 - 32 Volts
RCA / Cinch 2 - 8 Volts
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 senitivity 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 26, 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 32. 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
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
J 3
J 4
J 1
J 2
J 3
J 4
Installation
Summary of Contents for V TWELVE DSP
Page 2: ......
