Question about Koiiler XM-60 Car Audio Amplifier

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I have a xm6660.... yellow light...

My amp comes on for maybe 2 seconds and the yellow light that says thermal comes on and goes off. I dont get any sound. This anp is on my highs, but I dont get any sound out of the amp on my subs either..

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Re: I have a xm6660.... yellow light...

There are some things I want you to check, 1) Make sure your ground is good and I mean very good, 0 ohms resistance to the negative battery terminal 2) Make sure that your AMP is grounded to that ground point you checked in step 1. 3) Make sure that your power supply B+ wire is one continuous run no taps or spliced connections. 4) Your speakers and woofers are all properly impedance matched to your amplifier (if your amp is 8 ohms then your combined speakers impedance must be 8 ohms total). 5) voltage regulation to amplifier is good. 6) Check all connections and ground points again After these items are done power on your unit and then see if the problem happens again, if it does the issue is inside of the unit, one of the internal components has gone bad and you will need a schematic, a multimeter, and an audio tracer to work on the AMP with.

Posted on Sep 10, 2007

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I have a Jl Audio 250/1 mono block amp and the thermal light keeps coming on what could be causing this?

It could be a number of things? 1 to many subs, speakers wired to the amp causing it to overheat and making the thermal light come on. 2 It all depends were your amp is. If it's clear and nothing covering it, obstructing it, Ie sub in front of it, amp inbetween the rear seats and sub.

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Thermal light goes away when ground added

Doesn't sound like anything is wrong. If the thermal light is on before you have the ground hooked up then the amp is probably getting a small amount of electrical ground from the shielding on the RCAs or its mounting to the chassis of the vehicle allowing the amp to "barely turn on" (not enough ground). I can imagine this would make the amp think something is wrong (ie: thermal light) . May I suggest that you do not try to turn any amplifier on without ALL appropriate wires connected correctly.

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Depending on what light it is. It could be your ohm light, if it is your ohm light then you have something wired incorrectly. If it is another light, it could either be a power problem or it could be that your amp is damaged.If you would like, you may e-mail me and u can let me know which light is on. It SHOULD say right next to the light; which light is on. E-mail me at and I will respond to you as soon as i recieve it.

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Re-check all the connections to the speakers, The uPC monitors all the outputs and if any are taking more power than they should, the uPC shuts the amp down to protect the internal components. Don`t use tape joints alone, try to run the cable the full length without any joints. If you do have to piece the wires together, solder them and stagger the connections, in other words, make one lead shorter than the other so that if the tape does come off, the offending connection is well away from the other so they can never meet or connect to each other. Ian

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My amplifier keeps on protection always i want to know what can i do to solve the problem or what should be creating it? Someone told me that maybe a capacitor blow up but i opened it a they seem normal,...

Amps normally have several kinds of "protection" modes. Common ones are thermal, voltage, and short. Do you know which one you have? If the amp isn't hot, and goes into protection immediately before doing anything, we can rule out thermal protection. The next thing you should do is disconnect the speaker/subwoofer leads from the amp so that it only has power, ground, and remote connected. If the amp comes on with no speaker load, connect the speaker and see if it goes into protection. If it does, then you probably have a short-protection. Hope this helps.

May 14, 2009 | Performance Teknique ICBM-892 Car Audio...

1 Answer

Amp cuts out

Check your ground wire that's more than likely the problem.Try grounding it in a different spot make sure your ground is a paint and dirt free surface also make sure its directly metal to metal.

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3 Answers

Jl audio 250/1 thermal light

Disconnect all speaker wires from the amp and disconnect the RCA cables from the amp. If it still goes into protect mode, use a multimeter to confirm that you have 12v on the B+ and remote terminals. Place the black meter probe on the ground terminal of the amp when measuring the voltage. If the voltage is sufficient and the amp goes into protect, it will have to be repaired. JL only accepts repairs from authorized dealers. You'll have to find one in your area or you'll have to find a repair shop willing to work on JL amps.

Let me know if you have any other questions.

Oct 15, 2008 | Jl Audio 250/1 Car Audio Amplifier

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You may have an issue with the impedence of the woofers causing the unit to go into protection mode. Make sure that the woofers are no lower than 2 ohms at the amp. This can be done with a voltmeter to check. You are better off running the woofers at 4 ohms if possible. If you disconnect the speaker wire from the amp, does the yellow light still come on? If so, then there may be a problem with the amp.

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bad head unit or look at your ground wire good luck

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It sounds like you may have a power-supply problem. You need to measure the DC voltage across the B+ and ground terminals of the amp. If it doesn't remain near 12v when the amp is on, you need to determine why the voltage is dropping. It could be due to a defective fuse or a corroded connection at the battery.

Aug 29, 2007 | Koiiler XM-60 Car Audio Amplifier

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