HELIX U 8A Manual page 12

General instructions
General instructions for connecting HELIX
active subwoofers
The active subwoofer may only be installed in vehi-
cles which have a 12 Volts negative terminal con-
nected to the chassis ground. Any other system
could cause damage to the HELIX U 8A / U 10A and
the electrical system of the vehicle.
The positive 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 val-
ue of the fuse is calculated from the maximum total
current input of the car audio system.
Use only suitable cables with sufficient cable
cross-section for the connection of the active
subwoofer. The fuse may only be replaced by
an identically rated fuse (25 A) to avoid damage
of the active subwoofer. Higher values can lead
to dangerous consequential damage!
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We recommend that you perform a short function
test at low volume to ensure that the active sub-
woofer is functioning correctly before final installa-
tion.
Prior to installation, plan the wire routing to avoid
any possible damage to the wire harness. All
cabling should be protected against possible crush-
ing or pinching hazards. Also avoid routing cables
close to potential noise sources such as electric
motors, high power accessories and other vehicle
harnesses.
Attention: Ensure that the active subwoofer is cor-
rectly connected (phase), i.e. plus to plus and minus
to minus.