Question about Rockford Fosgate Punch 500a2 Car Audio Amplifier

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My Sub Doesnt Sound Good

I bought my PUNCH 500-a2 amp from my brother and im not sure what I should have the settings on.

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  • Thomas Capo
    Thomas Capo Apr 01, 2008

    thank you these settings work good.

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The settings are all pretty much dependent on your ear. But some guide lines would be for the input gain, never turn it all the way up. Turn the gain up about half way possibly 3/4 of the way up. There should also be a filter, if you are powering subs then you want to filter out any high frequencies. So if there is a switch saying HPF or LPF you want LPF (Low Pass Frequency). Then there should be another "knob" that controls the frequency. At the least, you want your sub amp to be tuned below 50 Hz any lower is up to your ear. I hope this helped.
-Andrew Hawkins

Posted on Mar 29, 2008

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My Rockford 500 A2 amplifier shuts off after playing music for a while and then after a little bit turns back on by itself. The power light goes out on the amplifier when this happens and when I touch the...


Make sure the amp is well ventilated, it needs to cool down or else it will shut itself off, then when it has cooled off enough it will turn on again. Also, check your wires especially your power wires. Make sure that they are the correct gauge. If everything looks ok then there may be a fault in the amp.

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The spark could be from the capacitors in the amplifier charging. Make sure the main fuse from your battery is still good and also check all the fuses on the amplifier. Verify all the wiring is correct and make sure none of the wires from inside the positive cable are poking out and touching the vehicle or amplifier chassis. If you have a 1k ohm resistor, you can put it in series with the amplifier power line to slowly charge the capacitors. You can do that by following the directions from the link below. After doing all that, remove the 1k resistor, hook it all up and try it again. If it still doesn't work, make sure your remote wire coming from the head unit has a voltage on it when the head unit is on. You can get a cheap volt meter from a hardware store or wal-mart.

http://www.ehow.com/how_7203337_charge-capacitor-car-stereo-system.html

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Not sure if you are getting two subs or single?

Anyways, amp is rated at 800 watts and probably under rated so it will push sub. Remember that you don't need to worry about max power, rather focus on RMS power rating.

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make sure you run your ground and power wires on one side of the car and the rca's on the other, keep them sepparate. if you have all wires running to your amp(rca's/12v power/remote), then you run the chance of either getting interference from the alternator, or if you have a pinched wire(usually by the door step) it may short with your battery wire. Double check your rca's and make sure they're ok and also check for corrosion on your wires.

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My Jl Audio 500/1, power light comes on but no power to subs


maybe it dont have enough to push it ,,did you try it before you buy it?

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Connect rockford fosgate amplifier & speaker together


Assuming your P3 has a single voice coil (it will have only one place to plug your wires into) you will be running this in a bridged mode. You will take the left (+) coming off the amp and plug it into the (+) on the P3. Then take the right (+) from the amp and plug it into the (-) on the P3. This will make your amp push 500 watts to your sub. Now on the amp make sure your adjustments are as follows: Signal input switch is set to unbalanced for RCA input. Left Phase switch is set to 0. Right phase switch is set to 180. your X-card should be set to low pass. And adjust the gain for both R and L equally so it has equal power from both channels.

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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.

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1 Answer

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your Volfenhag 12" subs are rated at 1200 watts they are only 600 watts rms and the Rockford punch p4004 is only 200 watts rms so the answer is yes it will work but if you get a amplifier that pushes out 500 - 600 watts rms you will love the sound from subs
there is nothing wrong with the Rockford amp it just wont pound out the bass as hard but the good news is you will never blow the subs with it
when buying amps or subs make sure to look at rms rating that is the true power they actually have ie. (sub box says 1200 watt you think powerful but if you divide it in 1/2 you actually get 600 watts rms) don't get me wrong that's a nice rating. for a sub but you will want to match that number with the amps rms rating or lower. The RMS is what makes the car pound the higher the RMS the better
hope this helps

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I bought a 500/1 jl audio amp and also a w7 10 sub


if its cutting off and right back on then check your ground and your power wire makes sure both are connected good and none of your fuse's are blown, either that or you got a wire hooked up backwards in the sub.. but my guess is that the sub is hooked up wrong... that sub should be hooked up in a series or in parallel,

ok if your running just one speaker, it should be hooked up like this and 2 speakers are a different way...

this is parallel :pos to pos , neg to neg, then one wire coming from pos on sub to pos on amp then neg on sub to neg on amp but bridge the amp on your amp should be 2 pos and 2 neg in two different channels take the pos off the sub into the pos on 1 channel and then the neg from sub to the neg on the other channel,

this is series : on the sub it will go pos to neg then the other neg and pos will go to the amp, but make sure the pos and neg r on different sides of the sub, dont hook them both to the same coil

if your need more help give me your email and ill send you a pic of how to do it...


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