Alpine mrv-1000 problem.

[itte]

When I listen music really quietly, it plays fine, but when I put it louder there comes a lot of distortion. It has never done so before, so what I should measure first? ( I have red other threads of mrv-1000, but anyone doesn't have same fault like me) If anyone can help, I would be grateful, thanks in advance.

MRV-1000

[Perry Babin]

If the amp only shuts down when it's driven to relatively high volume, you need to confirm that you have sufficient power supply voltage. With your multimeter set to DC volts, the black meter probe 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 probe alternately to the B+ and remote terminals of the amp while driving the amp to the point of distortion. If the voltage drops below ~11 volts, you need to check the wiring feeding whichever terminal the voltage is dropping on. If both the B+ and remote turn-on lines are low and your battery is fully charged, you may have a bad ground connection.

Have you tried disconnecting the speakers from one channel at a time to see if the speakers/wiring are the problem?

[itte]

Battery voltage is 14,2 and from amplifier reading is the same, no dropping there. I disconnected mrv-1000 and put my mrv-500 in and there was no distortion.

[Perry Babin]

It appears that there may be a power supply problem inside the amp. It could be as simple as a bad connection on the power supply connectors or more serious like failed power supply FETs.

Does any connector or fuse holder show any signs of overheating?

[itte]

Originally Posted by Perry Babin

It appears that there may be a power supply problem inside the amp. It could be as simple as a bad connection on the power supply connectors or more serious like failed power supply FETs.

Does any connector or fuse holder show any signs of overheating?

No, it is everywhere like new.