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Thats nice Boncuk, I like the ACS712. Andy
The whole setup might only cost you a couple of resistors and caps per amp.
Are you saying my suggestion costs AC power?
A lot of those little amp chips (5W etc) are capacitor coupled to the speaker anyway. Adding a second cap at the speaker shouldn't affect sound power in any significant way.
The OP already said he doesn't need big amp power levels or great HiFi.
I missed that requirement. If that's all he needs, than one of the simpler schemes, such as monitoring a DC current in the loop as you suggested, should work.Good point! In that case the best system would be to use microphonic pickup on each speaker to test everything in the audio chain, including failure of the voice coil in the speaker or even the speaker cone.
I was responding to the OP (his post in #5) for a system to detect if the speaker wires were cut or unplugged.