[quote name='Mr. Foxen' timestamp='1324413573' post='1474041']
If DC did break voice coils, most of my cabs would break because I use a 9v battery to check I wired all the speakers in the same polarity.
[/quote]
It kind of depends on the amount of DC, as DC can of course refer to any amount of current or voltage. But then you all knew that as you all know electronics. 9VDC at some milliamperage won't hurt a speaker and is fine for testing. 30VDC+ at 3 or 4 amps will fry the coil and bend the cone as it will make it stand out like, well, a standy-out thing.
ficelles