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Owner’s Manual/Installation Guide – 5
• The Kappa 255a has five levels of circuit protection that
monitor the amplifier and will shut it down if the
electrical system voltage drops below 10 Vdc or exceeds
15.5 Vdc, temperatures are above 194° F (90° C), short
circuits occur, or current draw exceeds product
specifications. For best performance, check the intended
mounting site to make sure the operating environment
does not create conditions that will trigger circuit
protection.
• Prior to installation, turn off all audio systems and other
electrical devices. Also disconnect the (–) negative lead
from the vehicle’s battery.
• At the installation site, locate and make a note of all fuel
lines, hydraulic brake lines, and electrical wiring. Use
extreme caution when cutting or drilling in and around
these areas.
• Use the amplifier as a mounting template to mark
locations for the mounting holes.
• Check clearances on both sides of a planned mounting
surface before drilling any holes or installing any screws.
Remember that mounting screws can extend up to an
inch behind the surface.
• Always wear protective eyewear when using tools.
• The Kappa 255a uses gold-plated, industrial-grade
Weco® plug-in connectors for power and speaker wiring.
Because of precision tolerances, do not insert the
connectors into the amplifier without pre-wiring them
first. Once the wires are fastened in each shell, they
provide additional gripping area for easy connector
removal.
• When routing cables, keep input signal cables away from
power cables and output speaker wires, as shown in
Figure 5 (below).
• When making connections, make sure that each
connection is clean and properly secured. Observe the
polarity markings on the front and rear panels. Refer to
the application drawings (Figures 1 through 3 on pages 3
and 4) to set up the amplifier for operation of various
configurations.
• If the amplifier’s fuses need replacement, use only
the same rating and type as replacements. Do not
substitute another kind.
+–
Battery
Fuses
LF
RF
LR
RR
SUB
Kappa 255a
Amplifier
POWER and
REMOTE Cables
Chassis
Ground
Chassis
Ground
Chassis
Ground
Source
Unit
Ignition
SPEAKER Cables
AUDIO Cables
Figure 5. To minimize possible noise pickup, use this suggested cable
routing scheme to plan your amplifier installation.
PRECAUTIONS AND NOTES