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Planar Speaker Asylum Welcome! Need support, you got it. Or share your ideas and experiences. |
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In Reply to: Damping is the dissipation of energy. posted by Al Sekela on July 21, 2010 at 15:31:23:
Yes, yes. we agree on all the basics.
Where we differ is that the power does not go to heat in the amp. With LOW Rdon.. Resistance of Device ON, the amp can be seen as a near-short from the viewpoint of the speaker BACK.
So, the back EMF generated by the speaker is self damping to the extent that the amp is seen by the speaker as a dead short.
TEST:: Install a couple ohms of a decent power resistor in your speaker wire. Your bass damping should go from good to bad, not the other way.
This would seem to be the major distinction between current source and voltage source amps.
TEST:: With a bare driver, do the 'thump' test. Put a couple ohms across the woofers terminals and the damping goes away. Use a paper clip, and the woofer self damps in a big hurry.
We also agree about your last paragraph Tubes don't like what? Capacitive or Inductive reactance? I can't 'member.
One thing not addressed and is indeed an edge issue is that of speaker 'Q'. I haven't bothered to sit and think about this, but it would seem that a critically damped speaker of Q=.71 would be fine with certain amps while a very low Q=0.5 would be ok with hi DF tubes. There is probably no helping Q-1.3 speakers, but they'd work as well as possible with Hi DF amps.
Just thinking about that for now.
Good talkin' to you again, Al.
Too much is never enough
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- RE: Damping is the dissipation of energy. - pictureguy 07/21/1016:55:51 07/21/10 (0)
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