What would cause a voice coil winding wire to break on a woofer?This has happened twice and no DC voltage has been measured from sources or amp.Have gotten no answer from speaker company .
Has it broken, been crushed, or was it burned? In voice coils that have been overheated, by too high an input power; the winding coil will separate because the binder(varnish/epoxy) has melted. It can then break from vibrational fatigue, or just rattle annoyingly. Often, in the case of too high an input power; the wire will melt like a fuse element. If the woofer is overdriven and exceeds it's linear range; the voice coil can contact the bottom, or top edge, of the magnet gap and be crushed. That, in itself, can break the VC wire or destroy the binder(with the same effects as burning). If the VC wire simply opened up, without abuse; it may have been improperly wound or poorly bound(bad quality control).