Question about Rockford Fosgate p-450.4 Car Audio Amplifier

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I have a punch 450.4 that with no rca's plugged in or speakers hooked up just a good 4 gauge power wire, 4 gauge ground (about 7 inches long) and a 16 gauge remote wire the power light comes on for a second then protection then the power light then the protection light over & over, i'm stumped. i've triple checked the wiring and hooked a punch 200.2 up to the rca's and speakers the 450.4 was running and its fine. i was only using 2 of the 4 chanells bridged at 4 ohms to 2 8 ohm punch power 12's. what could it be what do the lights going back & forth mean?

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1 Answer

How to connect wires to amp


Most amps have 3 places where you need to hook up wires to power them. the 1st is a ground wire that at best is 1 foot long and it goes on the ground or negative 12 volt connection then a bolt on the car you may need to sand off the paint for it to work, 2 a RMT or remote wire that is normally in the middle of the power and the ground connections the remote turns the amp on and off so it needs to go to the remote wire on the radio or a ignition spot on the fuse box - turns on with key on and off when you turn the key off , 3 the power wire is hopefully large 4 gauge wire and goes to the + 12 volt plug on the amp this wire has a in line fuse and goes to the battery and to the amp only. RCA wires go from the radio to the amp and are round and just plug in with no screws some factory radios need a conversion kit you can get at walmart for RCA wires. the speaker wires have some sort of mark or line to tell you what to put were like if you put the line on a negative on the amp you need to put the line on the negative on the speaker box to or it will not bass and could hurt your amp. ask me if you need anything else :) and please rate :/

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1 Answer

I plugged up an Legacy LA470 300x2Ch amp. It stayed in protect mode and never changed to power mode. I checked the power and ground, works fine, then remote, works fine. I then checked the output to the...


I would suspect if the amp is known to be good, that someplace you have a shorted speaker wire... possibly someplace the insulation is cut through or maybe you have a bad connection with frayed strands shorting out the speaker. Use an ohmmeter to check the resistance between each set of speaker leads and then to ground.

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1 Answer

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if helpful please rate 4 thumbs up.

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1 Answer

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3 Answers

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1 Answer

Not a problem just a question


  • 100 watts RMS x 2 at 4 ohms
  • 200 watts RMS x 2 at 2 ohms
  • 400 watts RMS x 1 at 4 ohms in bridged mode
  • stereo or bridged mono output
  • 4-ohm stable in bridged mode
  • Tri-Way capable
  • requires 8-gauge power and ground leads — wiring and hardware not included with amplifier
  • 50-250 Hz high-pass/low-pass (12 dB/octave) crossovers
  • wired remote included for fingertip control of Punch Bass (0-18 dB boost at 45 Hz)
  • MOSFET power supply and output devices
  • MEHSA mounting technology increases the heat transfer from the MOSFET output devices to the heat sink, for higher power output, lower operating temperatures, and greater reliability
  • TOPAZ — noise-killing differential inputs that eliminate 80% of ground loop noise
  • Trans•ana circuitry keeps preamp voltages low and signal paths simple for outstanding audio quality
  • NOMAD — advanced protection circuitry for "intelligent" shutdown protection
  • speaker- and preamp-level inputs
  • 11-1/8"W x 2-3/8"H x 9-7/8"D


  • Wire your sub in bridged mode (4 ohm mono)
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    - to - on amplifier
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    Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

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