Question about Jensen XA4150 Car Audio Amplifier

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Need nore help with Protect light

I've read the other posts and i'm not sure they are answering my questions about the protect light. i wired my amp, it played fine for about two hours. then it stopped. i think that was due to over heating. now, when i turned it back on the next day it will play only at low power output from my radio...if i turn the radio up past 27 (0-62) the protect light turns on and the power light turns off...this happens for about 5-10 seconds then it flickers to the power light and flips right back to protect light... ultimately leading to no bass. what did i do wrong, what should i check first/last?

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Try it with no load first to see if speakers are defected.if not check all connections to ensure full current.especially GND .hit me up for more info if needed.

Posted on Aug 09, 2007


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Disconnect all speaker connections and rca cables. Leave power, ground and remote wires intact. Try turning on again. If you still have a protection light your amp is faulty. Hopefully you have warranty. Double check all connections .A thumbs up would be greatly appreciated if this answer is helpful to you. Worth fixing.

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Protect, Protection, Protector, etc. are all indicators of a problem with the output (speakers) of the device. Most times, if you're lucky - you'll find a shorted speaker wire. Other times, it can be an expensive fix. Hopefully, you shut it off right away without cranking the volume up.

Start at the rear of the unit. Make sure no individual strand of the speaker wire has touched the binding post of an adjacent speaker. Continue along each speaker wire to the binding post or termination point on each speaker. Make sure the insulation along the entire length of all the wires haven't become crushed or damaged where they pass under rugs, around corners, etc.

If you can't find a problem, you can try disconnecting all the speakers and plugging in headphones. and power on again. If the Protect message is clear, you should be able to hear the program through the headphones and have full control over the volume. This means there is stall an issue with the speaker wire(s) from the back of the unit up to and including a speaker(s).

If it still indicates Protect, the original problem continued long enough or the volume was turned up high enough to cause an internal failure of the amplifier's output transistors and will require service t restore to working order again.

I hope this helps & good luck!

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Disconnect all speaker connections and rca cables. Leave power, ground and remote wires intact. Try turning on again. If you still have a protection light your amp is faulty. Hopefully you have warranty . Send to Rockford Fosgate for repair .A thumbs up would be greatly appreciated if this answer is helpful to you. protect-zb4bomd1rt4qms0dqd12kkt2-3-0.jpg

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Lanzar amp 1000 watt stays on protect mode

Hello snow11879,

I haven't been able to locate any support information online about your product, other than the email contact for support questions:

If the amp stays in protect mode all of the time, I would suspect a short in the speaker wiring or speaker(s) voice coil(s), or perhaps a faulty ground. If it plays for a short period of time and then goes into protect mode, it is most likely overheating. First check all of the wiring. Test your speakers on a known good amp and make sure there are no places in your wiring where the insulation may have been damaged, causing an intermittent problem.

Many owners have reported that this particular amp has a tendency to overheat. Also, when run in bridged mode, the speaker impedance needs to be at least 4 ohms. It will overheat if the impedance is below 4 ohms.

Hope this helps.

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I have a yamaha amplifier in here for repairs, the model no is A500, i cannot get the speaker protect relay to come on, i have replaced all the transistors & capacitors in the speaker protet circuit to no...

Measure DC to ground on the output transistors to check for any offset. The protect circuit is the least likely to be the problem. Post the readings here and I'll guide you from there.


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If the protect LED is lit, the amp probably has shortedoutput transistors. To eliminate other possible causes, read throughthe following page:

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Let me know if you have any other questions.

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It appears that the amp is going into protect mode. To eliminate external causes, read through the following page. Let me know if you have any other questions.

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How to change the Red Protect light to Green Power.

If the amp goes into protect mode, it's likely due to shorted output transistors. To eliminate other possible problems, read through the following page:

Amp in Protect Mode - Troubleshooting

If the problems are not with the wiring, follow the link at the bottom of the page to the Amplifier Repair Primer page.

Let me know if you have any other questions.

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