Alpine 3555 Owner's Manual page 12

Refer to Figs. 3 — 6 on pages 4 — 7.
Before making connections, be sure to turn the power off to all audio components.
Insulation tubes for the speaker leads and the power supply leads are supplied with the
3555, route the speaker leads and the power supply leads separately through these tubes.
CAUTION:
Always keep the CH 3/4 RCA inputs of the 3555 connected to a signal source while the
amplifier is in operation. If CH 3 and CH 4 inputs are not tied to the signal source, the
source and the amp will not have a common ground reference point, and high output
distortion may result. This is due to special grounding characteristics that have been
implemented in the 3555 to ensure an installation-noise-free operation.
@ Speaker Output Terminals
The 3555 has two sets of speaker outputs. Be sure to observe correct speaker output
connections and phasing. In the stereo mode, connect the right speaker output to the
right speaker and the left to left. Connect the positive output to the positive speaker
terminal and the negative to negative. In the bridged mode, connect the left positive to
the positive terminal on the speaker and the right negative to the negative terminal of
the speaker. Do not use the speaker (—) terminal commonly for right and left speakers
or connect it to the vehicle's chassis ground.
NOTE:
Do not connect speaker leads together or to chassis ground.
@ RCA Input Jacks
Connect these jacks to the line out leads on your head unit using RCA extension
cables (sold separately). Be sure to observe correct channel connections; Left to Left,
Right to Right, Front to Front, and Rear to Rear.
© Battery Lead (Yellow) (Included)
Connect this lead directly to the positive (+) terminal of the vehicle's battery. Do not
connect this lead to wiring in the vehicle's electrical system. Be sure to add a 40
amp (or two 20A fuses in parallel) as close as possible to the battery's positive (+)
terminal. This fuse will protect your vehicle's electrical system in case of a short
circuit. If you need to extend this lead, the wire gauge should be 8 AWG or larger.
@ Remote Turn-On Lead (Blue/White) (Included)
Connect this lead to the remote turn-on or power antenna (positive trigger, (+) 12V
only) lead of your head unit.
@ Ground Lead (Black) (Included)
Connect this lead securely to a clean, bare metal spot on the vehicle's chassis. Verify
this point to be a true ground by checking for continuity between that point and the
negative (—) terminal of the vehicle's battery. Ground all your audio components to the
same point on the chassis to prevent ground loops.
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