Question about Rockford Fosgate Power 501BD Car Audio Amplifier

2 Answers

Jerky rca input/beeping from ground connection

Had this amp 3 years now and over the last 2 weeks it started making a beeping noise from the ground connection...i opened it up and saw nothing only i could pinpoint where the noise is coming from....just over the last week everytime i go over a bump the bass thuds hardcore...i have 2 of these amps so i took the rca's out of tis one and put them in the other one and it doesn't i put it back in the other amp and wiggled it a bit and the thudding went crazy..somthing loose?? i am considering taking it into a repair shop but i want to check here first to see if there is a simple,cost effective solution BTW: the amp itself still works great but the beeping and the new thudding are cause for concern any input would be appreciated

Posted by Chris Gore on

  • Chris Gore May 18, 2006

    i have 2 grounds on the chassis one to the capacitor and 1 to 3 amplifiers via distribution block...this is the only amplifier with the problem..i am using all 4g wiring for power and ground....looks like a repairman will be recieving my amp sometime soon then...thanx anyway for the advice

  • Chris Gore May 18, 2006

    right where i plug in the ground wire there are 2 coils and some capacitors(i think) it is coming from there just behind where the wire goes in



2 Answers


  • Level 1:

    An expert who has achieved level 1.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 4 Answers

From what you say i feel that you have a dry joint around where the rca socket is soldered on to the board- use a magnifying glass and plenty of light to look around the sockets,They may be soldered under the board which means you need to disassemble the whole amp in most cases. a dry joint is basically a slight crack(very hard to see sometimes) around the solder which causes the subs to thud. but i might also be a faulty rca socket. Pretty easy to fix if your good with a slodering iron,all you have to do is to reheat the solderpads so the solder flows again and then hopefully it will set properly without any dry joints. If not take it to a tech and he should have it fixed in no time and should only cost like 20-30 bucks, might be a little more if you need a new socket but not much,probably another 10-15 bucks.You said that you could pinpoint where the beeping was coming from, Can you tell me where or what it is coming from?

Posted on May 18, 2006



  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert whose answer got voted for 500 times.

  • Master
  • 3,130 Answers

Sorry man but this sounds like the start of a horror flick???lol Ok Sorry man but if it occours from the ground then you need to move the ground and reinforce the ground of needed as maybe the chassis or ground your using is not up topar as a matter of fact try running a direct ground from the battery to the amp at least a size 10 to 08 size wire. Good luck

Posted on May 18, 2006


Add Your Answer


Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Which inputs are the better connections to use, the low level (RCA), or the high level inputs that have the least engine whining noise?

The RCA connections are best. If you have electrical noise, make sure you have good ground contacts. I'm talking all of the ground connections in the vehicle. You can also use a ground loop isolater to prevent some noise.
Ground Loop Isolators (a page with some explanation/theory)
They can be bought pre-made for about $15 - $20. The one pictured is an example.


Oct 05, 2015 | Car Audio & Video

1 Answer

Loud noise from subs amp is grounded well

Check the output of the amplifier with the input connections disconnected. Does the sound go away??

If it does, then connect each input one at a time and see what happens. If the sound appears, then do the following:

The ground connection on RCA connectors don't always make a good electrical connection. This is the outside ring. If the RCA connector goes in easily, the the outside ring should be compressed slightly to garantee a snug fit. Do all of the RCA connectors, at the amplifier end and at the radio end.

It could be the way that the amplifier was installed. the ground lead should run directly to the battery NEGATIVE terminal. This will greatly reduce noise produced by other equipment.

Jan 31, 2015 | Car Audio & Video

1 Answer

Hi i purchased the bnps102 woofers and used them for 2 weeks i really enjoyed them and i also purchased the pyle 1400 watt amp and a jvc deck along with the boss amp kit installation now the speakers about...

If the lights on your sub box aren't coming on it's either your ground of power wire came loose or the transformer blew. As for the subs, make sure all the connections are good, especially on your RCA wires. If your amp is getting power, then check your speaker connections. Also, make sure to turn the gain know up. The gain knob is located next to the RCA input on the amp. Let me know if this helps.

Aug 21, 2011 | Pyramid BNPS102 Car Subwoofer

1 Answer

I have a boss bass 1200 low profile amplified sub that isn't working. my power wires connected and receives juice, my ground is grounded, and my remote is hooked up. also my rcas are connected and the...

+ positive from battery ground is of course - anywhere on body put it on avoid sparks if + is powered up! U can put a link between remote and positive it should then be on. Led normally goes blue rca s need a signal from stereo make sure its a amp out or sub out not an input on stereo set all knobs to middle and if speaker is connected to amp speaker + - it should be on, try an mp3 player with jack to rca for testing a known signal.amp may have loop rca make sure its on inputs.some have high inputs too using speakers wire stick with rca

Jan 17, 2018 | Boss Car Audio & Video

1 Answer

There is a engine noise coming out from my speakers

(1) If you have an ohm meter check from neg terminal of battery to body of your car. It should be below 1 ohm. You should get the same reading between the amp neg terminal and the amp ground point. Check amp ground with the power off and the wire to the negative on the amp temporarily disconnected. Most cars have a braided uninsulated ground strap from the engine to the body or frame. In older cars this can break and it usually causes noise. Run a temp ground wire from the battery neg to the bat neg of your amp, if the noise goes away it's a ground issue for sure.
(2) Make sure the amp is well grounded ! The bolts that anchor the seats to the floor are one of the best ground points I know of.
(3) I've fixed a few amps that had an internal broken connection from the RCA's on the amp where they connect to the circuit board. This often happens from not having the amp bolted down and/or the RCA's getting hit or kicked. This will cause noise in the amp and requires taking the amp apart to fix it.

Apr 02, 2010 | Solid Audio Formula Series F4 4-Channel...

2 Answers

Sunfire annoying popping noises

If you remove the volume knob, and tighten the nut below, it should take care of the popping noise, as well as any input noise issues. Based on my experiences with my MKII

Apr 01, 2009 | Sunfire True Sub MK II Subwoofer

2 Answers

Whinning noise when car is on and AUX is connected to ipod


Mar 30, 2009 | Boss AVA-1215 5-Band Car Equalizer

2 Answers

Car stereo pre-out signal noise

Two things, a ground loop isolator in-line with the RCA's between the head unit and the first amp.....also a noise reducing capacitor ( $5 or$6 at an auto parts store) on the alternator 12v post will reduce or remove the hum.

I’m happy to assist further over the phone at

Mar 29, 2009 | Pioneer KEH-P3700 CD Changer

1 Answer

My car amp works produces distorded noise . As I plug in the rca cables i noticed that if just the tip of the connector touches i get a good sound but if i insert the whole connector it becomes distorded...

You have a grounding issue.

The RCA inputs of the amp are many times NOT tied to chassis ( the chassis of the car ) ground.

Same goes for the RCA outputs of your head unit.

The speaker outputs of your amp SHOULD NOT EVER be tied to chassis ground.

  • make sure that no speaker wire from the amplifier is touching or attached to ground.
  • Make sure that your amplifier ground (GND )( of the 3 power inputs.....GND, +12V, Rem) is securely mounted to a bare metal spot on the frame. Best practice is to have the amp GND, and the head unit GND at the exact same physical point.
  • Make sure that your RCA cable shield ( not the center tip, but the part around it ) is not touching the chassis.
  • Make sure that you have not nicked the wire while installing it and are accidentally getting a connection to the frame of the car.
  • Make sure that the head unit is grounded properly.
  • IF for some reason you have an equalizer between the head unit and the amplifier, make sure it has its own switching power supply INSIDE the EQ.
Bad grounds are a pain to of luck....Rob

Mar 17, 2008 | Audio Players & Recorders

1 Answer

Weird sounds coming through speakers

The problem is not likely the amp. The length of the ground to the amp is not as critical as a good solid connection. Clean any paint and dirt from around the ground connection. It should be clean and shiny metal. Anyway as a test disconnect the RCA's from the amp while the amp is on and see if the sound goes away. If it does then the problem is not in the amp but either the RCA cables, the RCA grounds in the head unit (radio) or bad routing of the RCA cables. Depending on the how old the car is this noise can be coming from your spark plug wires as well. As a last resort you can try a new set of supressor ignition wires for the car.

Jul 13, 2007 | Rockford Fosgate Punch 401S Car Audio...

Not finding what you are looking for?
Rockford Fosgate Power 501BD Car Audio Amplifier Logo

233 people viewed this question

Ask a Question

Usually answered in minutes!

Top Rockford Fosgate Car Audio & Video Experts


Level 3 Expert

85239 Answers

Daniel Dollive
Daniel Dollive

Level 3 Expert

315 Answers

The Knight
The Knight

Level 3 Expert

76514 Answers

Are you a Rockford Fosgate Car Audio and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides