HELIX V EIGHTEEN DSP User Manual page 26

Hardware configuration
site www.audiotec-fischer.com) and in-
stall it on your computer.
2. Connect the amplifier to your computer us-
ing the USB cable that is included in deliv-
ery. If you have to bridge longer distances
please use an active USB extension cable
with integrated repeater.
3. First turn on the amplifier and then start the
software. The operating software will be
updated automatically to the latest version
if it is not up-to-date.
8. Adjustment of the input sensitivity of the
analog signal inputs
ATTENTION:
the input sensitivity of the V EIGHTEEN DSP
to the signal source in order to achieve the
best possible signal quality and to avoid dam-
age to the amplifier. It is also mandatory to ad-
just the "Voltage Range" to the output voltage
of your signal source (see page 23, point 1).
The input sensitivity of each channel pair can
be optimally adapted to the signal source us-
ing the DSP PC-Tool software.
The setting of the controls affects both the
lowlevel and the highlevel inputs!
The gain control ranges are:
Low Voltage Range configuration:
Highlevel:
Line (RCA / Cinch): 1 - 4 Volts
High Voltage Range configuration:
Highlevel:
Line (RCA / Cinch): 2 - 8 Volts
Input sensitivity is factory set to 11.3 Volts
(highlevel) and 2.8 Volts (Line / RCA / Cinch).
This is definitely the best setting in most ap-
plications.
If the signal source provides a lower output
voltage, the input sensitivity can be smoothly
increased via the DSP PC-Tool.
If your signal source delivers a higher output
voltage – for example, if a factory-installed
amplifier serves as signal source – the input
sensitivity must be lowered and the correct
configuration of the "Voltage Range" jumpers
26
It is mandatory to properly adapt
4 - 16 Volts
8 - 32 Volts
must be checked (see page 23, point 1).
If you are not sure regarding the signal sourc-
es output voltage, please contact your HELIX
specialist dealer.
Therefore follow the subsequent steps:
1. Turn on the amplifier and then start the
software. The function can be found in
the "Signal Management" tab of the DCM
menu under the item "Main Input → Input
Gain".
2. Select the setup method to adjust the input
sensitivity.
Standard Gain Setup: This method allows
go globally set the input sensitivity for all
input channels (only with "Low Voltage
Range" jumper plug-in position – see
page 23, point 1).
Advanced Gain Setup: This method allows
an individual setting for each channel pair.
3. Adjust the volume of your radio to approx.
90 % of the max. volume and playback
an appropriate test tone, e.g. pink noise
(0 dB).
4. If the clipping indicator in the DSP PC-Tool
already lights up (see the following pic-