"Bill" wrote in message
t...
liquidator wrote:
"Bill" wrote in message
. ..
liquidator wrote:
There are, and have been for some time, amps in the kilowatt and
higher
range using PWM. Your info is 20 years old.
Raw power yes, but I wouldn't call it audiophile quality.
I know about those and they might make for good football stadium amps
but fidelity doesn't count there.
Bill Baka
pure bull.
http://www.digiamps.com/
http://www.cadaudio.dk/hifiamplifiers.htm
It wasn't "Pure bull" that long ago. I visited both sites and while
neither mentioned their actual clock frequency, Cadaudio did mention
that they have now gotten better fidelity by raising their PWM clock.
The clock and inductors needed used to be the limiting factor, and the
cost. The THD at 1KHz of 0.02% does look good (now) but that does
increase more with frequency than with a linear amp. As higher speed
transistors come out PWM amps will get better. Both of these
manufacturers are pretty obviously for the high power do it your self
audiophile since they are open frame units. I doubt you will see them on
sale at Wal-mart any time soon.
They both appear to be Danish so that explains why I haven't seen
anything like that on this side of the pond.
Sometimes I have to provoke someone who knows about something to post a
link to the group, thinking they are calling my bluff, but in fact
providing information I don't have time to chase.
Digiamps seems to have some very low prices, while Cadaudio is more what
I would expect at about a kilobuck.
Provoking a response usually works, so I have to thank Liquidator for
providing us all with 2 more bookmarks in the audio arena.
It's just the way I post.
Bill Baka
PWM is generally more advanced in Europe.
The only American manufacturer I know really pursuing it is Tripath.
There is nothing inherently worse about it,just many businesses look at new
technologies as a way to make things cheaper instead of better.
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