Question about Rockford Fosgate Punch P325.1 Car Audio Amplifier

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I just hooked up my RF 325.1 Amp to my Sony CDX-M30 deck and a small 10" Alpine Sub in a small box. I ran the wiring according to the install instructions for the Amp, but I am getting a very loud low Hum from the sub. I get bass out of it, but unless it is turned down almost all the way, the hum is over powering. This is in my boat, I ran an independant power cable from the sub to my Positve Battey block and an independant Ground cable from my Negative battery block, The RCA cables are plugged in from the deck to the Amp and the REM Power is connected to the Remote Power on the deck. The 2 speaker wires are connected from the Amp to the Sub. The ony deviation I made from the instructions is the Negative line is much longer than 3 feet, it is about 15'. This is because it is in my boat, and there really wasn't a ground anywhere near the Amp location. I either had to run an independant neg. line to the battery or splice into another ground of unknown length. How do I get rid of this Hum? Thanks Mark

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The reason for the 3' min. on your ground cable is that interference is picked up with longer gound cables. Especially if it passes close to any electrical components, e.g. spark plugs, capacitors, anything with electrical current. These signals are amplified within the amp. (because this is what amps do) and distributed to your speakers. you could try a noise filter / noise suppressor but I've never had luck with those. You could also try finding a metal part of the frame (if there are any) and attach your ground to a bolt along that frame and if your more advanced you could create a hole and use a screw to tighten the ground to the frame. Small note to that, boats create a lot of vibration so use a ground screw with a sort of tooth like seration at the head that grips as it tightens (so it won't come lose). If you have an extra battery you may want to attach the amp directly to an independant power source to see if your getting the same hum. A direct short in your electrical system will create the same sounds. A bad ground your electrical system will do this also. You may also want to check you high and low band pass frequencies if applicable. Set them to high and you'll get a hum. I would start there adjusting them down or setting them to the center and adjust accordingly if this stops the hum. I'm running 4200 watts all together and if I adjust to high I get interference just from the force of the amp itself. Good luck. Hate electrical problems on vehicles, too many wires.

Posted on May 25, 2011

  • markkowall May 25, 2011

    Can I make my own Ground by using a large metal screw or bolt and a pair of washers screwed into the fiberglass structure? Does that work?

  • ray0427c May 25, 2011

    No, has to be the metal frame that the battery ground is attached to. If any. Boats are limited when it comes to metal. Have you tried adjusting the low and high Frequency band passes yet. And is it a buzzy / whiny type of sound when motor runs or a power surge type of hum like a transformer.

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