opaqueice Wrote: > Huh? Again, DC has nothing to do with it... even if it were present, it > would simply slightly shift the equilibrium position of the cones. > Sound waves (or air flow) are not created by DC. I don't want to join in the debate over the audibility or otherwise of absolute polarity, as I have no experience in such experiments, but I would just like to make a quick point about DC and its effect on speakers.
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. -- cliveb ------------------------------------------------------------------------ cliveb's Profile: http://forums.slimdevices.com/member.php?userid=348 View this thread: http://forums.slimdevices.com/showthread.php?t=23759 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
