Question about MA Audio M1889I Car Audio Amplifier

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Amp is randomally shutting off

A friend of mine has a legacy amp i think its the 4000 watt version and has 8 gauge running to it with 2 12 in cadence super tx subs and the subs are bridged to 4 ohm on the amp and the amp will shut off all of a sudden when he changes songs or just in the middle of the song any ideas

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  • 631 Answers

If the amp shuts down with no pattern, you need to measure the DC voltage on the power terminals.

With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low.

Since there is no pattern, you will have to watch the meter for a while so you can see the meter drop when the amp shuts off. If the meter never drops on either the remote or B+ terminals (when the amp shuts off), the amp may have an internal fault.

Posted on Apr 26, 2008

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1. Is the MA unit an M1889i?
2. Do you have the 4 terminals of sub-woofer tied together. For example the 2 positive terminals are tied together & the 2 negative terminals are tied together?
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While I'm waiting to hear back from you, I'll try to draw a schematic (wiring diagram) of the way it should be wired for your particular setup that I'll send to you.

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1 Answer

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