Question about Jl Audio 500/1 Car Audio Amplifier

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Amp powers up, then shuts down 15 seconds later...

My amp powers up, no sound... then powers off 15 seconds later... HELP

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  • fatmatt540 Sep 21, 2008

    mine does the same thing it's the green power light

  • amueller00 Dec 12, 2008

    exact same problem. it makes me sad. it lights up just normal. looks like its gonna work. then turns off. and i didnt use it for more then 2 months when i swapped cars and instantly doesnt work.

    and trust me, i take very good care of my equippment, it was never scratched or dropped or mishandled. just stopped working. anyone figure out what it is?


  • tonyttran Dec 19, 2008

    power lights is green then turns off. remote is connected not sure why.

    after disconnecting the ground and plugging it back in would stay green then turn off.


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  • 631 Answers

Which lights are lit on top of the amp when you power it up?

Which ones light up during the 15 seconds that it's on?

Are you running a signal sensing system or are you turning the amp on via the remote lead?

Is the signal sensing switch set to on or off?

Posted on Sep 05, 2008

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I have a kenwood kac-9152d amplifer and it works just fine for about 10 minutes then just shuts off and subs dont work, about 30 seconds later my amp turns back on with the subs.


make sure it's well ventilated. If there's no air flow, then there is no way of cooling down and to protect itself it will shut off. Make sure the speakers are wired correctly as per amp specs. too many subs or subs connected improperly can draw too much current and shut the amp off, but you will notice this when you turn up the volume to a certain point and the amp shuts down.

Aug 30, 2011 | Kenwood KAC-9152D Car Audio Amplifier

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New 200-2 amp installed in 2008 dodge ram quadcab with 5.7 engine and 136amp alternator- when voltage goes over 15 with power demands amp shuts down for a couple of seconds at a time from what i was told...


The problem is that the numbers on that amp might not be correct. If I'm not mistaken, it's not considered CEA-2006 compliant. So the "birth sheet" might be skewed provided the picture is the correct amp you are talking about. Back in 2003 or so the Consumer Electronics Association (CEA) got with all of the audio companies and pretty much told them that they needed to regulate the ratings on amps by 2006. They made them put two ratings on on the birth sheet. They put a rating of 12 volts as a minimum and 14.4 volts as a maximum. A 15 volt load to the amp will cause it to go into protection mode. What confuses me is how are you getting 15 volts with a 136 amp alternator and other electronics running.

Apr 21, 2011 | Rockford Fosgate RF2002 Car Audio...

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I hooked up 2 capacitors into my amp and every time I put power to it the amp shuts off and 10 seconds later a red light comes on for 5 seconds and the amp don't turn on, basically it goes into protect...


Well, I have no idea why you would have two capacitors on a 500 watt amp but, did you charge the capacitors? Have you tried the amp without the capacitors? What size power wire are you using?

Sep 20, 2010 | Kenwood KAC-9102D Car Audio Amplifier

1 Answer

KAC9103d been running great for a year, factory refurb. for a month been losing sub output. checked all connections again, everything good. Turned on went driving 15 minutes later lost bass ckd again red...


Could be that you have a partially roasted(blown) coil on one of your subs which will function- but will keep tripping your amp.You can check that out just by using a different set of subs to listen to and by the process of elimination if the problem goes away then you know where the problem is at.Also check your gains you might be riding the gain a little high which causes distortion which causes heat(FAST) which will cause the amp to shut down completely or some amps will decrease output in a programmed attempt to save itself.turn the bass boost down to half if you even use it at all- that too can cause massive distortion in the amp itself,meaning only that if you have the bass boost on your deck turned up and then you turn the boost up on your amp the sound signal is then WAYYY distorted which will cause a thermal shutdown too. Last thing is to make sure that your subs arent running below 2 ohms because i believe that particular amp is designed to put out about 900 watts at 2 ohms.good luck

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1 Answer

Every time i turn it on it will stay on for a few seconds and then the red light on it turns on


these amps are junk you can et one twice as good for a better price. they all shut down when giving power sooner than later.

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1 Answer

Amp runs but then will just turn off and red light comes on


you may have fried the amp pre outs in the head deck, try the amps on another stereo

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Xtant 3300x


It sounds like it's going into protection mode.

Do any of the channels pop when it's switching on and off?

If you power it up via a single 15 amp fuse (in series with the B+ line), does it blow the fuse when it powers up?

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Mtx 1501d no sound


There are a number of things that can cause it to act as you described. Have you pulled the covers off of it yet to see if you can see any problems?

If you do, disconnect power from it and don't touch ANYTHING on the board when ANY of the 3 LEDs (2 are not visible from the outside) are lit.

Aug 19, 2008 | MTX Thunder 1501D Car Audio Amplifier

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Protection Mode? amp wont start


With your multimeter set to DC volts and the black meter lead on the ground terminal of the amp, touch the red lead alternately to the B+ and remote terminals as the amp shuts down. If the voltage drops below ~11 volts, you need to check the wiring feeding whichever line is dropping too low.


If the voltage remains near or above 12v, disconnect all speaker wires and signal cables from the amp. If it powers up, the wiring needs to be checked. If it still shuts down, the amp likely has blown output transistors.

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