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External fuse rating table
Model Fuse rating
APX2181 30 Amp
APX4361 50 Amp
DPX2251 50 Amp
DPX1851 90 Amp
DPX11551* 200 Amp
* This amplifier has no amplifier-
mounted fuses. Always use a 200
Amp fuse installed at the battery.
English
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Cables
• Whenever possible, route power wire and signal wire on opposite sides of the
vehicle. This prevents the signal cables from picking up electrically radiated noise.
• Protect all wire from damage. Where a power wire passes through the fire wall or
near exposed metal edges, protect the wire with a rubber or plastic grommet. Use
wire loom where possible for further protection.
• Extra cable can cause signal loss and act as an antenna for noise. Use only high
quality RCA cables that are no longer than necessary to make a direct
connection with the source unit and amplifiers.
• Make sure each connection is clean and secure. Insulate final connections with
electrical tape or shrink tubing.
CAUTION
Improper connections may result in
unreliable operation and damage the
amplifier or the vehicle.
Grounding the amplifier
• A good chassis ground connection is
critical to minimize resistance and avoid
noise problems.
Use the shortest wire possible.
Clean off any paint, primer or sound
deading prior to making this connection.
To minimize resistance and avoid noise
problems, securely connect the ground
wire to the car chassis and the source
unit ground. Using existing bolts is not
recommended.
• The last connection you make should
be the ground wire at the amplifier. As the
power supply capacitors in the amplifier are not charged, a spark may be
produced when you make this connection.
Use a test light with an incandescent bulb between the ground terminal and the
power wire to charge these capacitors if this is a concern. The ground wire is the
most important connection to the amplifier. Make sure it is both electrically and
mechanically sound.
APX_DPX Amps.qxd 2/6/2008 11:53 AM Page 12