Question about Rockford Fosgate Prime R500-1 Subwoofer Amplifier

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Blue light on. no power protect light on either but the amp lets out no sound the sub is good and all the fuses are good

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  • 33 Answers

Maybe rca cables or wires from amp to speakers

Posted on Oct 16, 2013

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Posted on Jan 02, 2017

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SOURCE: power light vs. protect light mode

If the power light on top of the amp is on, the internal power supply is operating.

It is possible that the amp could damage the speaker if it has blown output transistors. Before you connect a speaker to it, you should measure the DC voltage across each pair of speaker terminals. If the DC voltage is more than a fraction of a volt, the amp needs to be repaired.

The amp requires an external fuse. Download the owner's manual from the rockford site.The correct fuse for the amp will be specified in the manual.  

Posted on Nov 01, 2007

  • 631 Answers

SOURCE: amp blowing fuses

The amplifier probably has shorted output transistors.

Disconnect the speakers and RCA cables. Replace the fuses with two 10 amp fuses or a single 20 amp fuse. If the amp blows the fuse when it powers up, the outputs are almost certainly the problem. Don't try it with the two 30 amp fuses. The smaller fuses will provide more protection for the power supply. If the amp powers up with the smaller fuses and they don't blow, check the speakers and the wiring (for shorts to ground or shorts between wires).

Posted on Nov 22, 2007

  • 109 Answers

SOURCE: My amp only powers the subwoofer when the radio is on but wont when the cd player is on

The person(s) who hooked up your system made a boo boo. They wired your remote turn on lead to the power antenna lead instead of the amp turn on line (both are blue and easy to mix up). Thus when your radio is on it sends a signal to the amp and the amp turns on, but when you set to CD the signal goes away and your amp shuts down. Easy fix, just re-wire the amp turn on lead and the problem will be fixed.

Posted on Jun 24, 2008

SOURCE: i think my ex blew my amp

model number? im thinking 401s? if so that should be the only light on

Posted on Aug 18, 2008

  • 21 Answers

SOURCE: rockfordfosgate P6002 amp protect light goes on

are u sure u have them running at the right ohms, for not only the subs but the amp too...if you go lower than your amp is rated you can fry stuff...via protect mode......hopefully this helps

Posted on Mar 21, 2009

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could be the speaker its hooked up to . try to disconnect the sub and see if the protect light goes out

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might have roasted your speakers voice coils a little which may be sending the amp into protect mode throw a speaker on it that you know works and if it doesnt trigger the protect circuit then you probably have a blown or almost sub.

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Amp burned out but fuses still good?


this is caused by inproper wiring from the speakers/subs to the amplifier.. an amp will still put out power to subs and speakers when it's wired improperly but it won't last for very long doing it... 6 months is longer than usual....

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Amplifier Problem


never ask geeksquad about amps lol check your ground wire connection and push on sub do you feel scratching if so its blown sub also never turn an amp up all the way it starts pushin dc voltage witch a 200 watt amp can blow a 800 watt sub dc voltage is not good for subs also up all the way can burn out the internal battery in the amp lets hope thats not it just make sure ground is good protection light means that the amp has power but a connection is not bien made sum where to complete the circut

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If it is not turning on your problem is it is not getting power. Check your fuses. The reason an amp goes into protect mode is usually because the subs are not wired up right. Make sure your fuses are good, you have a good ground, and make sure your amp turn on wire didn't come loose when you were putting the deck back in. As for the amp going into protect you probably wired the subs down to too few ohms and the amp you have can't handle it. Try hooking the subs up straight w/o bridgeing them and turn it up to see if it works. If you don't have problems with it then you wired your subs wrong.

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1 Answer

Amp powers on, no sound from subs


the output is blown. It is in need of service.
There are many different ways that an amp can fail but the two most common failures are shorted output transistors and blown power supply transistors (< those are not blown). There are several types of protection circuits in amplifiers. The most common are over-current and thermal. The over-current protection is supposed to protect the output transistors. Sometimes it doesn't work well enough to prevent the failure of the output transistors but it will work well enough to shut the supply down before the power supply FETs are destroyed. If the amp remains in protect mode, goes into protect mode or blows the fuse as soon as the remote voltage is applied, shorted output transistors are almost certainly the cause.

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1 Answer

Amp works when beaten


It sounds like you have a broken connection in the amplifier. The first thing to check is the fuse. Sometimes the contacts become weak on the fuse holder and the connection becomes intermittent. Any other troubleshooting would require opening up the amp. Any repairs would require resoldering the broken connection.

Let me know if you have any other questions.

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2 Answers

Fuse keeps blowing?


The fuse is a protective device. Fuses dont blow unless the amp ( in your case ) is drawing too much current. DO NOT put a bigger fuse in. Obviously, there is a problem with the amplifier inside the sub. If the sub is under warranty, send it in for repair to an authorized warranty depot. If not it's not under warranty, then take it to the authorized warranty depot anyway. Why ? because they will have the schematics ( electrical diagrams ) to troubleshoot the unit quickly and it may be a common problem. If it is a common problem, the factory may have released a modification and possibly it could be covered under warranty under a factory 'goodwill' program. Good luck. Rob

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