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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  • 113 Answers

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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Posted on Jan 02, 2017

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Hello snow11879,

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

support@lanzar.com

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.

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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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Does it go into protect in the vehicle if you disconnect the speaker wires from the speaker terminals of the amp?


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The most common cause is an unsafe load/speaker impedance. If you have the speakers wired correctly, you may have a short in the wiring. If the wiring is OK, the amp is likely defective

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

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It's most likely that the over-current protection is tripping at high power. At lower voltage, the amplifier can't produce as much output power and therefore can't produce enough current to trip the protection circuit.

You need to check your speakers to make sure that they are not shorted. With an ohm meter, the resistance across the voice coil shouldn't read any less than ~90% of the rated impedance.

If the speakers and the wiring are OK, the amp may have an internal fault causing the amp to go into protection.

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If the amp goes into protect with the wires unplugged from the board, the amp likely has more serious problems. It may have a shorted power transformer and almost certainly has shorted output transistors. If you think you may want to try to repair it yourself, read through the following page (particularly the information in the yellow box). Respond to this post if you have more questions.

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