HELIX V EIGHTEEN DSP User Manual page 23

Configure the HELIX V EIGHTEEN DSP as fol-
lows
Caution: Carrying out the following steps will re-
quire special tools and technical knowledge. In or-
der to avoid connection mistakes and / or damage,
ask your dealer for assistance if you have any
questions and follow all instructions in this manual
(see page 20). It is recommended that this unit will
be installed by an authorized HELIX dealer.
1. Adjusting input voltage range
Before proceeding to adjust the input volt-
age range, please take note of the following
guidelines. This adjustment is only necessary
when connecting devices from the following
categories:
- Aftermarket radios with an output voltage
exceeding 4 V RMS
- Premium sound system amplifiers with
an output power of more than 50 W RMS
For standard applications, such as connect-
ing:
- Factory radios
- Aftermarket radios with a maximum out-
put voltage of 4 V RMS
this adjustment is not required. In such cases,
you can proceed directly to point 2.
To set the input voltage range, follow these
steps:
a. Open the amplifier
Remove the side panel with the speaker
outputs by loosening the two Allen screws
and the Phillips screw. Afterwards slide out
the bottom panel to the side.
b. Determine the output voltage of the sig-
nal source
We recommend measuring the maximum
output voltage using an appropriate mea-
suring device or contacting your authorized
HELIX dealer. If you are unsure, we rec-
ommend setting all 9 jumpers to the „High
Voltage Range" (Line 2 - 8 V / Highlevel 8 -
32 V) to avoid potential damage to the de-
vice. To do this, the jumpers must be moved
to the factory-unused multi-pin connectors,
as shown in figure 2.
c. Place the jumpers in the corresponding
voltage range
To change the position of a jumper, simply
lift it upwards and insert it into the desired
position. Ensure that the jumper is fully in-
serted and not offset.
Overview jumper plug-in positions:
Low voltage range configuration ( by de-
fault / see fig. 1):
Value range: Highlevel
Line (RCA) 1 - 4 Volts
High voltage range configuration
(see fig.2):
Value range: Highlevel
Line (RCA) 2 - 8 Volts
Figure 1:
Figure 2:
d. Reassemble the amplifier
2. Connecting the pre-amplifier inputs
These six lowlevel line inputs can be con-
nected to signal sources such as head units /
car radios or factory installed amplifiers using
appropriate cables. Each input can be as-
signed to any output using the DSP PC-Tool
software. Input sensitivity is factory-set to
en
4 - 16 Volts
8 - 32 Volts
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