Well, it seems the Lanzar MNX250 amp is a piece of shit. The entire line. The exchanged amp i got had the same problem, even worse. It sparked so bad it blew it's fuse and popped a cap when i connected power to it even though the radio was off (it even did it when the remote wire wasn't even plugged in). Yes, everything was connected correctly. This lot of amps just seemed to have had a common fault where power was shorted across the power on relay circuit, keeping the amp on all the time.
I'm going to go with the SSL STA206 amp for my front speakers. It's 50% bigger than the Lanzar, but still pretty much the smallest amp in it's power range you can get. So pissed.
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