Question about Rockford Fosgate Punch 401S Car Audio Amplifier

4 Answers

Noise, not music, coming out my subwoofers

I bought a farad cap, so my amp would get more power. Cause my lights were dimming and stuff. After I hooked the cap up to the amp some weird sounds started coming out of the subs. The noise is a real high pitched sound. What can I do to fix this?

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  • michael schultz
    michael schultz May 11, 2010

    did you charge the cap before you installed it? if you did you would have use some sort of resistor like a domelight bulb or a resistor itself!

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I third it, check grounds and make sure you have good solid connection to metal, also what you're hearing is probably alternator noise, you might consider upgrading it, since it's obviously underpowered for your application, a cap is only a bandaid in the long run.

Posted on Jul 20, 2009

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It sound like you have a bad connection somewhere...Check your ground cables and make sure nothing has been cross wired.

Posted on Jul 19, 2009

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I would say a bad ground is giving you alternator noise through your subs. Also make sure your source unit has a good ground.

Posted on Nov 02, 2009

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  • 40 Answers

Sounds like a bad earth recheck all cables

Posted on Jul 14, 2009

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1 Answer

I have a 2008 Nissan xterra. I'm running all 0 gauge wiring to my jl system. 250/1 amp, 2 10" wo3 . My lights dim a little so I ordered a soundstream scx2 2 farad cap. I did not realize it was 24vdc


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Mi lights dim everytime mi speakers beat


simple issue means your alternator is not able to supply enough amps to keep the system running properly, recommendation get a capacitor to handle the extra load, it acts like a second battery, when the alternator charges the cap it takes the load off the cap rather then the battery, so the lights and system all run with sufficient power i recommend a 1 to 2 farad capacitor for your system if it is about 800+ watts, you will notice the difference immediately

http://www.bestbuy.com/site/olspage.jsp?skuId=8286482&type=product&id=1172880157454&ref=06&loc=01&ci_src=14110944&ci_sku=8286482

very good cap

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2 Answers

Lights dimming


Your lights are dimming because your system is pulling too much current from your car. Your battery provides long-term sustained power, but your system wants to draw power faster than your alternator and battery can provide it. When the amp attempts to draw more amperage than the battery and alternator can produce, it creates a voltage differential in your system, which attempts to steal electricity from the rest of your system (like your lights). The most common solution for lights dimming is to add some level of adequate capacitance to your car. Capacitors store electricity and deliver it quickly to your amps as needed. Capacitors resist voltage changes by producing large amounts of amperage. This means that the capacitor(s) will provide the electrical bursts that your amps want so that it doesn't have to steal it from your lights. You can start out with 1.0 Farad, if the problem doesn't go away, add another one, and so on until the problem is gone. You cannot have too much capacitance, it's just an electrical buffer for your audio system.

May 14, 2009 | Jl Audio 13W7 Car Subwoofer

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Power capacitor


From the Legacy Manual:


The supplied charging bulb(included
in the package)is used when initially
charging the Cap. the charging process
is accomplished by connecting the
charging bulb in series between the
battery’s positive post and the
capacitor’s positive terminal.(plese
refer to the diagrambelow). it is very
important to follow this process to
eliminate the possibility of damaging
the cap/battery, and other audio
devices. The charging process is
complete when the voltage of the
capacitor reaches the same voltage
as your vehicle’s battery. This process
will take a matter of seconds to
complete. You can use a voltage meter
to check the voltage across your
battery and cup .when the voltages
are the same on both(cap and battery),
the cap has been fully charged. The
charging bulb actually eliminates the
need for the volt meter, when the cap
is fully charged (cap and battery have
same voltage) the bulb will go either
dim or fully out.

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3 Answers

Jl audio


If the amp was hot, it probably has a serious problem. You should have it checked out by a qualified tech. Don't continue to use it. More serious damage could occur.

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Subwoofers


If the light on the amp is dimming when the bass hits it's usually a power related problem. It sounds to be that you don't have enough power going to the amp to drive the sub. It should stop if you reduce the volume at which you are playing the music. Yes?
How to solve this is to, increase the size of your power cables, add a power capacitor if needed & change the car battery to a higher capacity one.
The other option a little more professional, would be to fit a split charge system & a secondary battery to the boot/trunk of your car just to run your stereo system, with a power capacitor too. This will provide all the juice that your system requires so you can bang your head as long as you want :P

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