Question about Rockford Fosgate Punch P4004 Car Audio Amplifier

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Punch 40dsm wont power up

Hi there have got a punch 40 powering 1 sub in mono and has just stopped working tried obvious like poer to unit remote turn on etc etc any ideas please is there a manual reset button anywhere

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  • 631 Answers

There is no reset button, if you've confirmed that you have a good ground and sufficient voltage on the B+ and remote terminals, the ampifier is in need of repair.

If you're interested in troubleshooting/repairing it yourself, read through the following page to familiarize yourself with the inner workings of an amplifier.

Basic Amplifier Repair Tutorial

A common problem on these amps is broken connections on the remote turn-on connector lug. If it's loose in the board, that would be the first thing you'd need to repair.

Let me know if you have any other questions.

Posted on Sep 08, 2008

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1 Answer

Amp shut off has power and grond and remot but only my p550 shut off fuses are ok and all other amps are wourking


how many subs are you running on this amp, and how many ohms are they. if the are bridged, try hooking up stereo and see if the problem still occurs. make sure your scrape off all the paint where the amp is grounded to the frame which should be less than a few feet. i'd also recommend running at least a 4ga wire for both your power and ground.

Jan 30, 2011 | Rockford Fosgate Punch P550.2 2-Channel...

1 Answer

I have a rockford fosgate punch P325.1 subwoofer mono amp that blows a fuse every time i start the car. I have a second pioneer amp but that works with no problems. How can i fix this?


Is it the correct size fuse ? Is it the power fuse or remote ? Either way check your connections going into the amp . Try this hook your other amp to the set of wires for the rockford if that amp has a problem its a wireing problem if not chances are its an interal problem on the rockford . Hope this helps !

Aug 19, 2010 | Rockford Fosgate Punch P325.1 Subwoofer...

1 Answer

My sub woofer has recently stopped working. I borrowed and hooked up a friend's subwoofer and still doesn't work. However all my other speakers in the car are still working. Could this be the amp? If the...


If you only have the sub connected to the amp, the other speakers would still play, if they are just connected to the head unit. I would check for power and remote power to the amp, and check the ground, if those are ok, I'd say the amp is bad.

May 21, 2010 | Rockford Fosgate Punch 401S Car Audio...

1 Answer

My punch 550.2 amplifier's thermal light is turning on and off


well, hopefully the amplifier was wired correctly. But either way there are so many factors that can cause this problem... But the biggest one is the amplifier must have been sending some distortion to your subwoofers which a subwoofer can take a certain level of distortion and be fine but too much will blow any subwoofer even the highest of high end subs at a high volume... when your subs hit the point of blowing they will tend to just blow out one at a time... they don't just pop both right away. I'd say get the sub that isn't blown off off of the amp before it blows too... distortion is clipping most of the time... when you destroy the subs it will eventually work it's way to the next component in the system which is your amp and then you will be out an amplifier and subs. save yourself the headache.......

Dec 12, 2009 | Rockford Fosgate Punch P550.2 2-Channel...

3 Answers

Red thermal light on


well id say you have cooked your amp and or subs they can only take beatings for so long. show it no mercy it gives it back,does amp smell do subs smell borrow amp see if subs are ok if so it will be your amp.new one .keep the gain down??

Jun 11, 2009 | Rockford Fosgate Punch P550.2 2-Channel...

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)
    + to + on amplifier
    - to - on amplifier
    (using bridging terminals)

    Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

    Apr 25, 2009 | Rockford Fosgate Punch 401S Car Audio...

    1 Answer

    Amp is on but wont work...please help!!


    Hello lillj2323,

    OK, you say that the amp won't get your RF Punch's to pound. You do not say if you get any output at all. So let's start from the beginning.

    The KAC-X542 is a multichannel amp with 2 sets of stereo outputs, 1 set of stereo outputs and 1 bridged connection for sub(s), or 2 bridged connections for sub(s).

    Make sure that both 30A fuses just to the left of the power connections are good.

    Check that the "ID number" is set to "0". Make sure that you have RCA inputs to both channels A and B (leftmost pairs of jacks). Your subs should be connected to the 1st (+) and 3rd (-) of each set of output terminals.

    Make sure that there are no broken off plugs or pins in the jack marked "H/U Terminal" or either of the 2 jacks marked "remote".

    Check that the amp is set up for 2-channel bridged. The 6 switches below the filter controls and the filter pots should initially be set:
    1 - Middle position (off)
    2 - Up position (on)
    3 - Down position (off)
    4 - Up position (mono)
    5 - Down position (off)
    6 - Up position (mono)
    The pots should be set approximately:
    LPF - minimum
    HPF - maximum
    Input Sensitivity - match your head unit - probably between 1 - 3
    HPF - maximum
    Input Sensitivity - match your head unit - probably between 1 - 3
    After you get the speakers working, the LPF, HPF and Input Sensitivity can be tweaked for best sound and lowest distortion.

    Hope this helps.

    Apr 17, 2009 | Kenwood eXcelon KAC-X542 Car Audio...

    1 Answer

    I have a rockford fosgate p250.2 amp hooked up to two 12' subs but the amp is not powering on... instead the protect light is on and im not sure if its because its so cold outside... please help and thank...


    Remove the load from the amplifier (subs) and the RCAs
    Retry.
    If the light stays on, there are internal problems with the amplifier, and it needs to be serviced.
    If the amplifier works normally, attach the RCA's and power on again.
    If it remains on, connect one sub, and then the other.
    Your amplifier is a 2 channel amplifier rated at
    60 Watt - 4 Ohm - 2 channel(s)
    125 Watt - 2 Ohm - 2 channel(s)
    250 Watt - 4 Ohm - 1 channel(s)
    Your amplifier is not rated for a 2 ohm mono load.
    If you have Single voicecoil subs wired in parallel, you have a 2 ohm mono load - your amplifier will eventually fail.

    Jan 16, 2009 | Rockford Fosgate Punch P2502 Car Audio...

    3 Answers

    Amplifier has no sound


    Disconnect all speaker connections and rca cables. Leave power, ground and remote wires intact. Try turning on again. If you still have a protection light your amp is faulty. Hopefully you have warranty. Your amp is clipping.
    A thumbs up would be greatly appreciated if this answer is helpful to you. amplifier-no-sound-peeu4x5nsxvd53n2rwetiqa4-3-0.jpg

    Jan 10, 2009 | Rockford Fosgate Punch P325.1 Subwoofer...

    1 Answer

    No power


    hi, some car amps need a high current remote supply to turn on. first make sure that you are using the proper gauge b+ and gnd cable for this particular rockford amp. then try switching the remtote turn on to this amp thru a simple Relay.(use the remote supply from your headunit as a trigger for the relay). do these connections without connecting any spks or rca line inputs. once amp is switching on then connect all other cables. OR lastly check the main fuse on the RF amp?? cheers

    Jul 22, 2007 | Rockford Fosgate Punch P325.2 2-Channel...

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