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IMPORTANT! Disconnect the negative battery termi-
nal (-12V) or remove the main fuse near the car battery
before you start any wiring work!
The power supply of the car audio system must be
disconnected until the entire wiring and installation
is completed.
The recommended minimum power cable cross-section of the
main power supply cable is 20mm², but if you drive the amp very
hard, or you have multi amplifier setup, a 35mm² power cable
is recommended.
Using main power cables with smaller cross sections can result
in unnecessary over-heating of the amplifier circuitry, distortion
at high volume levels and may also cause the thermal protection
circuitry to shut down the amplifier(s).
Use rubber grommets when running cables through any metal
or sharp plastic, to prevent accidental shorting or shearing.
Make sure the cables do not interfere with normal operation
of the vehicle.
Especially the music signal cables (RCA interconnects) should
be kept far away from any potential sources of electrical inter-
ference e.g. electronic vehicle management systems (engine
computers, relays etc.) fuel pumps, wiring harnesses etc.!
4.1 ROUTING AND CONNECTION OF
POWER CABLES
Run the positive power cable ("+12 V") directly from the positive
terminal of the car battery to the amplifier. Make sure the power
cable makes good contact to the battery; i.e. use an appropri-
ate battery clamp that accepts big gauge power cables! For
protection of your car audio system and your entire car against
electrical fire hazards from a shortcircuit of the main power
cable with chassis ground, you must insert a main fuse (holder)
within the first 30cm of the battery. The fuse type/value should
be matching the limitations of your main power cable and the
requirements of your car audio system. Preferably a minimum
of 80 Amperes with this amplifier and an appropriate power
cable cross section.
Now you route the ground cable to the amplifier. It is best to
keep the ground cable ("-12V") as short as possible, i.e. to find
a chassis contact very close to the amplifier. The ground power
cable must have the same cross-section as the positive power
cable. It is recommended to use a corrosion-resistant gold-plated
power ring or a massive ground clamp between the ground
cable and the chassis ground point. Keep in mind that audible
interferences and problems originating in the power supply of
the amplifier, are mostly based on a bad ground contact. So a
good (and clean) grounding to the vehicle chassis is absolutely
crucial, to obtain best performance of your amplifier.
4. ELECTRICAL WIRING
NC-Amp 1-2-4-5-CH Manual_D+E_pfade.indd 25 09.05.2009 11:25:33 Uhr
25


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