Question about Crunch MXB2125 Car Audio Amplifier
Yes protect is an error code for short and overload. Once the power applied to the unit and shorts sensed by the processor the unit will automatically turned to "protect" to avoid further damaged to other parts. Shorts is in the supply voltage (B+, Vcc) line and most common caused is the sound output IC (mounted in heat sink). This part is responsible for amplifying the audio from the pre-amplifier stage and will feed to your speakers.
If you have a knowledge in disoldering and soldering technique, I would advice you to pull-out this part and then try the unit. If the protect error code is gone then you must replaced this IC with a new one to back your unit in normal operation again.
Let me know if you need further assistance.
Hope I helped you.
Have a nice day!
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Posted on May 20, 2011
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Posted on Jan 02, 2017
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Feb 21, 2013 | Cerwin Vega Audio Players & Recorders
It could be a short in your speaker wire or the crossover in your speakers.
1) Turn off your unit and disconnect your speaker wires at the amp, if the protect is no longer displayed when the unit is turned back on, check the connections on the speakers. If you do not visually see a short on the speaker wire connection, turn off the unit and disconnect the wires at the speaker and isolate them so they do not touch then connect the speaker wires at the amp. Turn on the amp and see if the protect is on. If it is on, the wire has a short somewhere in the line. If the protect is off then suspect the speaker has a short in the voice coil or crossover.
2) If the protect is still on after you disconnect the speaker wires at the amp, it could be the power IC in the amp is shorted and needs to be replaced.
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