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Protection light stays on - Car Speakers & Subwoofers

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Check all power connections and grounds. Be sure no wires are touching anywhere (including the subs) and be sure there is a good ground. check fuses

Posted on Dec 03, 2008

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My zx850.4 keeps jumping to protect i have cvr10" 2 ohm wired as vc series/ to pallel subs and it keeps jumping to protect its 2 ohm stable i can hook subs to my 300.4 that alreadyruns 4 speakers and it...


Be aware your amp can deliver more power to a 2 Ohm speaker, but will not work if the 2 Ohm speaker somewhere in the audio spectrum comes beneath the 2 Ohm. Because you want the sub, to go as low as possible, it could be the speaker will have a very low impedance under 20 Hz, causing your amp to go in protection.
The power you give to the amp, will not be the cause it going in protection. It is sensing the output current, so it will stay in the borders the end stage can deliver. Try two speakers in series and give the same power. If the amp is not driven into the protection, I think you are closing in to what is causing the problem.

Jul 06, 2014 | Car Speakers & Subwoofers

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No bass and power protectecter light stay on green with a sound


It is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be your output drivers- the MOSFETS/IC's fitted for both the channels, Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise like a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.
You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board, maybe the protect circuit by itself is shutting off due to a faulty bias , maybe a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the protect is off then check for short on the speakers.

Jul 25, 2011 | Car Speakers & Subwoofers

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The light on my technics amp suv500 is staying red, and there is no sound, why??


your amp is in "protection" their is posabley a short in you voice coil or you have a blown speaker. a short to ground could allso cause "Protection"

May 17, 2011 | Car Speakers & Subwoofers

1 Answer

Have a memphis pr400 amp and the protected light stays on...no sound


Make sure that your power/ground/remote wires aren't shorting out with anything and that you're getting 12v at the amp. Often times there's not to much that you can do when these lights come one. It's most likely being caused by internal components having gone bad.

Mar 02, 2011 | Car Speakers & Subwoofers

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Its on protect mode how do i take it off?


Generally if your amplifier goes into protect, you have a bad ground.
Unhook your power wire from the battery and trace your ground wire to the chassis of the vehicle. Strip the paint from the ground location, Put the ground wire back on the grounding location. Tighten the ground wire down securely with no play and hook back up your power wire.

Other cases revolve around the RCA cables.

Unplug the RCA's and see if the protect light goes off.
Plug one in and see if the protect light comes on and then the other.
If the protect light comes on, you have bad patch cables. Replace them and see if your issue is resolved.

If the amplifier was shorted, the system board made have been damaged.

Jul 28, 2010 | Car Speakers & Subwoofers

1 Answer

I have a JL total mobile audio T500.1 mono amp and it was playing then all the sudden it stopped and the power light which is usually green is now red and stays red and no sound comes from the subs any...


This happens when the amp goes into protection mode. 90% of the time, it means there is a short or has another issue inside the unit and has to be fixed or replaced. Hope this helps and good luck!

Jul 09, 2010 | Jl Audio Car Speakers & Subwoofers

2 Answers

Amp is going out.


Have you tried replacing all of your fuses? If that does'nt work check your ground........ I would check all your connections also could be a connection shorting out causing your red light to come on.

May 10, 2009 | Car Speakers & Subwoofers

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I have an older red sony xplod 500w 4ch amp. the power/protection light is glowing red. what does that mean and how do i fix it? I have no sound.


The protection light comes on if the amp overheats or if the speaker outputs are shorted.

Turn everything off and check all of your speaker wires for shorts. When you locate and repair the short, the protection light should go out and your amp will work normally again.

Hope this helps!

Mar 26, 2009 | Car Speakers & Subwoofers

1 Answer

Protect light on car audio amp wont come on green light is on


if the Protect light is on, that would be bad, if the green lights on you've got power thru your amp, meaning you have a good connection

Oct 16, 2008 | Car Speakers & Subwoofers

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