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Dear Customer,
congratulations on your purchase of this high-quality
HELIX amplifier, made in Germany. The new HELIX
PRECISION series amplifiers highlights best quality,
excellent manufacturing and state-of-the-art technology.
After 24 years of experience in the research & develop-
ment of audio products this amplifier generation sets
new standards. The attractive typical HELIX design
makes this amplifier an outstanding and top of the class
product.
We wish you many hours of enjoyment with your new
HELIX amplifier.
Yours
AUDIOTEC FISCHER Team
General installation instructions
To find out how HELIX amplifiers work best for you,
read this manual carefully and follow the instructions
for installation. We guarantee that this product has been
checked for proper functioning before shipping.
Before you start installation, disconnect the car battery
at the minus pole. We would urge you to have the instal-
lation work carried out by a specialist as verification of
correct installation and connection of the unit is a pre-
requisite for warranty cover of the HELIX amplifier.
Install your amplifier at a dry location where there is
sufficient air circulation to ensure adequate cooling of
the equipment. For safety reasons, the amplifier must
be secured in a professional manner. This is performed
by means of four fixing screws screwed into a mounting
surface offering sufficient retention and stability.
Before drilling the holes for the screws, carefully
examine the area around the installation position and
make sure that there are no electrical cables or compo-
nents, hydraulic brake lines or any part of the petrol
tank located behind the mounting surface - otherwise
these could be damaged. You should be aware of the
fact that such components may also be concealed in the
double-skin trim panels/mouldings.
General instructions for connecting the amplifiers
The HELIX amplifiers may only be installed in motor
vehicles which have a 12-volt minus pole connected to
the chassis ground. Any other system could cause
damage to the amplifier and the electrical system of the
vehicle.
The plus cable from the battery for the complete system
should be provided with a main fuse at a distance of
max. 30 cm from the battery. The value of the fuse is
calculated from the maximum total current input of the
car audio system.
Install the cabling in a manner which precludes any
danger of the leads being exposed to shear, crushing or
rupture forces. If there are sharp edges in the vicinity
(e.g. holes in the bodywork) all cables must be cushio-
ned and protected to prevent fraying.
Never lay the power supply cables adjacent to leads and
lines connecting other vehicle equipment (fan motors,
fire detection modules, gas lines etc.).
In order to ensure safe installation, use only high-quali-
ty connections and materials. Ask your dealer for high
quality accessories.
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1 Connecting the remote lead
The remote lead is connected to the automatic antenna
(aerial positive) output of the head unit (radio). This is
only activated if the head unit is switched ON. Thus the
amplifier is switched on and off with the head unit.
2 Connecting the battery cable
Connect the +12 V power cable to the positive terminal
of the battery. Recommended cross section: min. 16mm.
3 Connecting the ground cable
The ground cable should be connected to a central
ground reference point (this is located where the negati-
ve terminal of the battery is grounded at the metal body
of the vehicle), or to a bright bare-metal location on the
vehicle chassis, i.e. an area which has been cleaned of
all paint residues.
4 Fuses
The input fuses are connected in parallel and provide
protection against an internal equipment fault, i.e. the
system must be additionally protected by a further line
fuse located in the vicinity of the battery (max. distance
from battery: 30 cm). The fuse ratings are 3 x 25 ampe-
res, and both must be installed as the amplifier protec-
tion rating is 75 amperes (3 x 25 A).
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5 Fuse Function Indication
If the fuses (4) are destroyed due to malfunction the red
LED illuminates. In normal operation the LED turns off.
6 - 9 Signal input
The A4 Competition has RCA connectors for RCA
cables that can be connected with the pre-amplifier out-
put of the line-outputs of the headunit or of a pre-ampli-
fier i.g. HXE 100. This connectors are gold-plated to
ensure a better signal transmission.
8 - 9 Level controls for input sensitivity
These controls can be used to match the input sensitivi-
ty of the individual channels A and B to the output vol-
tage of the connected head unit. These controls are not
volume controls and are solely intended for the purpose
of sensitivity trimming. The control range extends from
500 mV to 8 V.
10 - 12 CPS - Color Protection System
This LEDs show the operation mode of the amplifier
green (10) = in operation; yellow (11) = malfunction of
the amplifier, short circuit at loudspeaker output; red
(12) = overheating
If the amplifier shuts off due to overheating it can take
a while until it turns on again. This depends on the out-
side temperature.
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