Question about Rockford Fosgate Punch P2002 Car Audio Amplifier
I installed 3 amps in my BMW 325 yesterday 2 fosgates 2502 for two 10? momo subs when I finished installing them I will raise the volume and a load knocking noise will come up, the I transfer the subs to the amp (this amp is an Infinity) for my speakers and everything sounded great then I tested both fosgate amps and my components and the same load knocking noise will come up. I checked all the connections everything look good. I have installed a few other systems but I never had problems before.
Hello tejano71, I would suggest that you check your grounding and if possible run an extra ground from the battery ground just to make sure. Then I would use an DC line voltage filter between the power supply and the AMPs. If this does not work. You may have an issue inside of the fosgate AMPs. To troublehoot these you will need a voltmeter (set to the AC setting), audio tone generator (multiple settings from 20Hz to 20 Khz), two dummy speaker loads (set to proper impedance and wattage), and an oscilloscope (to see if clipping is occuring). After you have these items, connect the dummy loads to the AMPs and then connect the ground wire to the AMPs, and connect the power supply to the Amplifiers. Put one of the oscilloscope leads across one of the dummy loads and the other oscilloscope lead across the other dummy load. at this point connect the Audio Frequency Generator and set it to 20Hz and increase it to 60Hz as you also increase volume at each frequency looking at the oscilloscope for any signs of clipping continue to increase as you get higher in frequency. You should see very little clipping. If clipping is seen the actual unit may have a voltage regulator problems. If the unit has voltage regulation problems, I would suggest that you take the unit to a repair shop for further investigation, I have repaired quite a few of these units and for the most part regulation on these items sometimes can go bad with very little warning. Let me know if this solves your problem, or at least points you in the right direction. Thank you, Shuttle83
Posted on Sep 05, 2007
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Posted on Jan 02, 2017
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