


Things I've tried:
Testing wires from amp to plug inside the door, both fine.

Testing wires from head unit to amp, both fine.


Swapping the left and right outputs on the head unit, this played the sound from the left channel on the right speaker, but left door speaker did nothing.


Another amp from eBay, this worked for all of 30 seconds and then the left channel stopped working again.


Have I got really unlucky and bought another dud amp, or is there likely to be something causing them to blow?