cliveb Wrote: > > It has been stated on a number of occasions in this thread that it's > harmless. Well it isn't. A genuine DC offset emerging from a power > amplifier (which would have to be DC-coupled throughout, of course, ie. > no capacitors in the signal path) is a very effective way to destroy > drive units. The constant non-zero voltage heats up the voice coil, and > if the voltage is high enough, the heat cannot dissipate quickly enough > and the voice coil melts/fuses. This can happen very quickly. The usual > symptom is that you hear a brief "thump" or "pop" when the amp is > connected, and the drive unit is toast.
OK, correct me if I'm wrong, but wouldn't you need a pretty big DC offset to do that? I think what you're saying is that the DC offset will drive a current through the coil, thus creating heat. But an AC signal also drives a current through the coil and heats it up... so the question is how much DC would it take to melt the speaker, and I thought (perhaps erroneously?) that as long as the DC offset was well below the max AC level the speaker can tolerate there won't be a problem. Is that wrong? In any case, there is no DC offset in the signal I tested, and I suspect there are very few, if any, amps that pass the DC to the speakers anyway. -- opaqueice ------------------------------------------------------------------------ opaqueice's Profile: http://forums.slimdevices.com/member.php?userid=4234 View this thread: http://forums.slimdevices.com/showthread.php?t=23759 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
