Question about Rockford Fosgate Punch 400W Class AB Bridgeable 4-Channel Amplifier w/ Variable Crossover

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Not enough Amp?

It powers my 2 12" punch subs full force then after a few minutes i lose all sub-noise. Is my amp too small?

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You should still get sound even with small amps but it would be rather weak. Check first the source of the signal. Test with different sources to be sure. Check for loose connections.

Posted on Oct 02, 2009

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Hi i have a few questions. I have bought a dual 12 " sub box and i need 2 subs and one amp to go with it. I want intence base that will impress! I am currently looking at 2 Alpine SWR-12D4 they are...


It's been my experience,that intense and low bass comes with a price,always remember u get what u pay for,so on that note,Try to get Rockford Fosgate Competition subs with a punch 250 or 500 trust me that it is a powerful combination.and if u can afford it get a choke to put on ur subs so they will only kick bass put tweeters in the dash and mid range speakers in the door u could use a dual rca jacks to install 2 amps at once and get a punch 45 amp for the tweeters and mids.hope this was helpful

Apr 03, 2013 | Car Audio & Video

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Amp worked fine one day and the next day i get nothing. the red light on the side is on but i dont get any sound. i took the subs that were wired on that amp and wired them on the other punch 800 i have...


did you check all fuses on amp and coming from battery power wire? also check the ground and rca cables connecting to the unit and make sure the remote wire (small blue wire) didnt come lose thats usualy a sign for the red light

Mar 26, 2011 | Rockford Fosgate Punch 800a2 Car Audio...

3 Answers

Why do i need to open my gain up to 3/4 to full turn inoder to achieve a loud bass?Im using punch 2400 amp and 2 12" kicker.


the amp may not be powerful or your setting on the cd player is not right try adjusting the cd player. turning the gain all the way up will damage your subs even go above halfway

Sep 19, 2010 | Rockford Fosgate Punch 801S Car Audio...

1 Answer

I have a rockford fosgate punch 150 and it will power a small 5 1/4" speaker, but doesn't seem to push my 15" subwoofer. I am reading 4ohms across the sub so I'm assuming that it is fine and that there is...


amp is way too small to power a 15 inch sub. But you should get some sound out of it, not silence. You can use a 9 volt battery to test your sub, if the sub pops when the 9 volt is placed across it's terminals then it's ok. If it does not pop then your sub may be bad, or the coil may be frozen. (It can still read 4 ohms if frozen). If your amp powers smaller speakers fine, you know it's not the amp. If the sub tests ok, then verify your connecting it properly to the amp's correct bridging terminals.

Jun 12, 2009 | Rockford Fosgate Punch 150S Car Audio...

1 Answer

What kind of noise it will bang or should i go with class d amps


If you run a pair of subs to each amp at a 4ohm bridged load per amp you will get the full power of the amps delivered to your subs-roughly 450 watts per sub as punch amps are all under rated-that sh%&t gonna bump hard - thats an incredible setup from an equipment standpoint- i run 1600watts on a pair of 15z and its freaking obnoxiously LOUD and yours will be moving more air than my 15s so it should be just mind numbing - go for it !!!!!!!!

Jun 04, 2009 | Rockford Fosgate Punch 800a2 Car Audio...

1 Answer

Amplifier loads


Hello ronnieyannon,
A single 4 ohm speaker wired to each channel, like you have them wired, presents a 4 ohm load. And it appears that you have them connected properly. The 401s is only stable to 4 ohms when bridged, so if you were to parallel the 2 4 ohm subs in bridged mode, the load would be 2 ohms and the amp would most likely overheat and go into protection.

I'd wire them the way you have them wired.

Each channel of the amp outputs only 100 watts into 4 ohms. That is adequate for regular full-range speakers, component speakers, mid-range drivers, and even some small subs. But it is a little low on power for most subwoofer applications.

Hope this helps.

Apr 22, 2009 | Rockford Fosgate Punch 401S Car Audio...

1 Answer

Amp is shutting off after 10 min of driving!! please help!!


Does it happen at all volume levels?
What is the gain setting on the sub amp?
Have you checked for 12V @ remote turn on after problem occurs?
Sounds as if the remote turn on relay inside the amplifier is losing signal, or has become damaged. If the protection light does not light up, the problem is not thermal, shorting, or high/low voltage.
The amplifier is in need of repair. This is not an end-user fix. Looking at about $50 to repair.

Thanks for using FixYa- a FixYa rating is appreciated!!

Feb 18, 2009 | Profile BAJA HA700M Car Audio Amplifier

1 Answer

Will not power


are u sure you didn't blow a fuse? check the fuses to make sure you did not blow one because the amp will not work in that case. make sure you are not over working your amp as well because it seems like that amp is not big enough to power all four of those subs. usually 4 channel amps are used to power speakers not subs. what is the rms on your subs and amp? i could better tell whether your amp is big enough. thanks hoped this helped

Jun 24, 2008 | Rockford Fosgate Punch 301S Car Audio...

1 Answer

Amp Issues


1) Make sure a bridged load of no less than 4 ohms is applied.
2) make sure both the left & right channels are working.

Jan 29, 2008 | Rockford Fosgate Punch P2002 Car Audio...

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