27
The positive wire has to be connected to the
battery’s positive post or a power distribution
block. Though the current draw of the HELIX
DSP ULTRA is rather low (approx. 650 mA) we
recommend a minimum wire gauge of 1 mm² /
AWG18 for both power supply wires.
8. Connecting the remote input
The remote input of the Power Input has to
be connected to the radio remote output if the
signal processors lowlevel Line Inputs or one of
the digital inputs (Optical Input / Coax Input) are
used as signal inputs. We do not recommend
controlling the remote input via the ignition
switch to avoid pop noise during turn on / o.
If the Highlevel Input is used this input does not
need to be connected as long as the car radio
has BTL output stages.
9. Conguration of the remote input
The DSP ULTRA will be turned on automatical-
ly if the Highlevel Input is used or if a signal is
applied to the remote input terminal. The Auto
Remote switch (page 23, item 5; Auto Remote)
allows to deactivate the automatic turn-on fea-
ture of the highlevel inputs. The feature should
be deactivated (Auto Remote = O) if there are
e.g. noises while switching on / o the signal
processor.
Note: If the automatic turn-on function is deac-
tivated it is mandatory to use the remote input
terminal to power up the signal processor! The
highlevel signal will be ignored in this case.
Note: The automatic turn-on feature of the
highlevel inputs is activated ex works.
10. Conguration of the DSP
The general DSP settings should be con-
ducted with the DSP PC-Tool software be-
fore using the signal processor for the rst
time.
Ignoring this advice may result in damaging
the connected ampliers / loudspeakers. Infor-
mation about connecting the DSP ULTRA to a
computer can be found on page 28.
11. Connecting the remote output
This output (Remote out) is used to supply re-
mote signals to the external amplier/s. Always
use this remote output signal to turn on the
amplier/s in order to avoid on / o switching
noises.
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