Question about MB Quart RAA1000 Car Audio Amplifier

2 Answers

Amp powers on, but stays in protect mode

Hi, I have a MBQuart RAA1000 mono amp, It powers on, but stays in protect mode. I have checked all the wiring and everything is fine. I have tried for almost 2 years to find a solution to this problem and cant seem to find a cause for this, or anyone that will fix an amp. If anyone has any idea what could cause this, please let me know. Also I feel I am a very technical person and would be comfortable fixing the amp myself if someone could point me in the right direction to get started. Thanks

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  • sneeedle Apr 18, 2008

    I took several pictures of the inside of the amp, along with a closer shot of a transistor I think may be bad? I have a multimeter, but not 100% sure im doing it right. The link to view the pictures is:
    http://myweb.usf.edu/~lmcgrego/amp_pics/

  • Anonymous Jan 29, 2009

    the protect light keeps going when i hit a small bump and sometimes it just doesnt go on. Sometimes both rights are never on and the amplifier isnt even working.

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Shorted output transistors are the most common reason for amplifiers to go into protect. How much do you know about electronics/electronic components?

If you're a newbie, read THIS page.

Would it be possible to send me a set of high quality photos of the amp's internals?

Posted on Apr 17, 2008

  • Perry Babin Apr 18, 2008

    sneeedle,



    That was my post (guest). I didn't realize that I wasn't logged in.

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In that group of transistors, measure the resistance from the center leg to the outer legs on each of the individual transistors. If you find any that read near 0 ohms, you need to remove them from the board and test them again. If they still read near 0 ohms, they're defective.

The SSP45N20B are difficult to find. The SSS45N20B should be a good substitute.

Posted on Apr 18, 2008

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Blue light on top flashing???not powering subwoofers.. was working fine.( blue light stayed on.) When I noticed it I shut the system down immediatley!!! Have'nt turned sytem back on since. What should I do...


You amp went into protect mode from an abnormal condition. Were you hammering on this amp when that started? I might suggest letting up on it a bit if so. Also check your wiring. Make sure all are insulated well and fully connected. It cut the noise off because if it would have continued it would have blown your amp. Make sure the fuse is good as well. Perhaps it is getting weak. Turn things down and turn the amp on. Give it a chance to cool for a bit first and then turn things down and turn it on. Everything a go? Then turn it up a bit then. My guess is it was getting worked a bit to hard and went into protect mode. Give the amp a rest from time to time. Good luck.

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when you hooked the amp up did you make sure your speakers were all in-phase positive to postive / etc.. a common issue with hi-power equiptment is grounding whatever input power supply gauge wire was used the ground has to be equalized, also if youre drawing too much on the amp (too much speaker/not enough amp ) this problem will continue till the amp cooks, check all phase, and if youre mono-bridging make sure this amp can be mono-bridgeable that would also send an amp into protection mode because its recognized as a short to positive-good luck

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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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Why does my amp stay in protect mode?


The most common reason an amplifier goes into or remains in protect mode is shorted output transistors. To eliminate other possible reasons for it to go into protect, read the following page.

Troubleshooting - Amp in Protect Mode

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