HELIX V EIGHTEEN DSP User Manual page 27

ture), you have to reduce the input sensi-
tivity using the scroll bar until the indicator
turns off.
5. Increase the input sensitivity until the clip-
ping indicator lights up. Now turn the con-
trol back until the indicator turns off again.
6. Repeat this process for each channel pair
you are using.
Various adjustment examples of the input
sensitivity can be found on page 28. For
further applications please contact your
HELIX specialist dealer.
9. Configuration of the internal DSP
IMPORTANT: The general DSP settings
should be conducted with the DSP PC-Tool
software before using the amplifier for the first
time.
Now you are
V EIGHTEEN DSP with our intuitive DSP PC-
Tool software. Useful hints for the correct set-
ting can be found in our knowledge base at
www.audiotec-fischer.com.
Caution: We highly recommend to set the
volume of your car radio to minimum position
during first start-up. Additionally no devices
should be connected to the amplifier. Espe-
cially if the V EIGHTEEN DSP will be used
in fully active applications, a wrong setup can
destroy your speakers right away.
10. Analyzing the input signal
Check the input signal for factory-set equal-
izing and all-pass filters using the Input
Signal Analyzer (ISA) of the DSP PC-Tool
software. Information about the ISA can be
found in the extensive Knowledge Base on
www.audiotec-fischer.com.
our website
Caution: We highly recommend to set the
volume of your car radio to minimum posi-
tion during first start-up. Additionally no de-
vices should be connected to the amplifier
able to configure
until general settings in the DSP PC-Tool
software have been made. Especially if the
V EIGHTEEN DSP will be used in fully active
applications, a wrong setup can destroy your
speakers right away.
11. Connecting the loudspeaker outputs
The loudspeaker outputs can be connect-
ed directly to the wires of the loudspeakers.
Never connect any of the loudspeaker cables
with the chassis ground as this will damage
your amplifier and your speakers. Ensure that
the loudspeakers are correctly connected (in
phase), i.e. plus to plus and minus to minus.
Exchanging plus and minus causes a total
loss of bass reproduction. The plus pole is
indicated on most speakers. The impedance
of the speakers of the channels 1 - 12 must
not be lower than 4 Ohms (absolute minimum
3 Ohms). All other channels can be loaded
with a minimum of 2 Ohms. The speaker out-
puts are not bridgeable. For subwoofer appli-
cations ideally use drivers with dual voice coil.
Attention: Solely use the supplied connection
cable with the 24-pin plug and flying leads for
connecting the speaker outputs 1 to 12 (see
your page 22, fig. 1).
:
12. Optional
The two pre-amplifier outputs (Line Output)
can now be connected to the pre-amplifier /
lowlevel / RCA inputs of the external ampli-
fiers using appropriate cables (RCA / Cinch
cables).
The outputs provide a maximum output volt-
age of 3 Volts RMS.
Please make sure that you always turn on / off
the external amplifier using the remote output
(REM OUT) of the V EIGHTEEN DSP in order
to avoid interfering noises.
13. Optional: Connecting the remote outputs
The remote outputs are used for turning
on / off amplifiers that are connected to
the line outputs of the V EIGHTEEN DSP.
Therefore connect the remote output of the
V EIGHTEEN DSP to the remote input of
your amplifiers to switch it on and off via the
internal DSP without interfering signals. The
remote outputs are activated automatically
Connecting the line outputs
en
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