On Jan 2, 3:26*pm, "Arny Krueger" wrote:
"Patrick Turner" wrote in message
Ian Bell wrote:
Don't know if anyone is interested but I got this little
snippet in the email form Elektor today:
http://tinyurl.com/82upa5
He seems to have discovered yet another type of
distortion which he has christened Dynamic Damping
Factor Distortion (DDFD).
Well, the DF does change during a wave cycle. Ra isn't
constant at all points; if it was, there'd be less THD
and IMD.
DF changes during a wave cycle is of course always there if the amp is
nonlinear, and all amps are at least a tiny bit nonlinear. It is only going
to have the possibiilty of being an audible problem with amplifiers that
have quite a bit of nonlinear distortion. Whether you would hear this second
order effect *among the primary effects of all that nonlinearity seems
doubtful.
We've spent nearly two decades telling you, dear Arny, that there are
subliminal effects that cannot (yet) be measured but that nonetheless
cause listeners to become uneasy, to prefer on setup to another for
reasons which they cannot quite articulate. All that the above tells
us is that you don't listen too well.
Andre Jute
Tear drop vase, tear drop vase, plum distressed -- Cash Register,
Heaton's, Bandon, Co Cork, Eire, Christmas 2008