Question about Pyle PLMRA420 Car Audio Amplifier

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Always in Protect Mode

I have a Pyle PLMRA420 1000w marine amp. It's practically brand new.I have never abused it or overloaded it. Even with all the RCA cables removed and speaker wires removed it's permanently in "protect" mode... I've changed the fuse and also tested the power source for 12v... it all checks out...
Any ideas on what I can fix on this thing to make it work again?

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6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

KaeZoo
  • 156 Answers

SOURCE: Protect light will never go off

Unfortunately, it sounds very likely that you have a defective amplifier. Usually you see a protect light on an amplifier because of an internal short, supply voltage too high, voltage too low, or speaker connections of too low impedance or grounded. If your speaker wires are completely disconnected, that eliminates the most common external cause of a protect light. Also, a protect light from the voltage being too high is very unlikely without the engine running (and an alternator problem). The "other positive cable" you're referring to is the remote input, and it won't cause a protect light no matter how it's connected. You'd need a voltmeter to do much more troubleshooting; a protect light can be caused by a very poor ground connection, or it's possible that a poor connection at the battery or fuseholder, or a defective fuse, is causing a severe voltage drop. However, based on what you've described, it seems most likely to me that your amp is defective.

Posted on Jun 07, 2007

  • 631 Answers

SOURCE: car audio amp in protection mode

If you power up the amp with the RCAs plugged in, does it go into protection mode.

If you power up the amp with the RCAs plugged in, does the woofer pop?

Posted on Oct 26, 2008

  • 5 Answers

SOURCE: amp goes into protect mode after volume is turned up

Not enough juice, check the power and ground connections, another possibility is to have dc in the input, try to use in line filter available from radio shack to cut the dc, also test the with one speaker at the time, you could have a bad speaker (shorted) too.

Posted on Apr 10, 2009

etirbynnor
  • 655 Answers

SOURCE: Trouble connecting marine amp to stereo

Hello lizskates814,

You can use either the high level (speaker) or the low-level (RCA's) inputs to the amp, but not both. Choose whichever one sounds the best or is more convenient to install and leave the other disconnected.

Hope this helps.

Posted on May 24, 2009

  • 77 Answers

SOURCE: Pyle PLMRA 400watt marine amp.

I'm assuming you mean channels 2 and 4? If you tried new cables and you know they work then you might wanna check to see if there is a 2,3,or 4 channel switch on the amp or just a switch that reads bridged. If a switch on an amp is set to bridged or 2 channels, whatever type of switch there is, then it would make the amp only run 2 channels. If there is'nt a switch and you have a signal on the cable your using then you may have some shorted transistors. Make sure you definately have a signal first before thinking some transistors are shorted. Take the rca's from the 2 channels that work and put them into the inputs cause you know those channels are working. Let me know what you find, I would like to help you more if you still have problems after this. I also do amplifire repair cheap. I have my own business and most of my customers are from this site, so if you need it repaired then I can help you out on this as well. Just send me a private message. Good luck

Posted on Aug 20, 2009

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