"Scott Dorsey" wrote in message
...
Trevor Wilson wrote:
"Scott Dorsey" wrote in message
...
Bret Ludwig wrote:
High bias AB amps operate in class A through most of the power range
they spend all their time in, giving the advantage of Calss A operation
where it is needed, and rather than running out of power when this is
exceeded they simply transition into Class B.
This is true. The problem, however, is that although the distortion may
be much lower in class AB than in class B, the distortion spectrum is
often
less pleasant, at least to my ear. I often find a given output stage
sounds
better biased into class B than up higher into class AB.
**Bull****. Only poorly deisgned Class A/B amps sound significantly worse
than an otherwise identical Class A amp. Pay careful attention to my
words:
"Otherwise identical".
That's not what I said. That is not at ALL what I said.
**True. What you said was bull****. Now, pay attention to my words. Focus
on: "Otherwise identical". Also focus on: "Poorly designed". If you, like I
have, taken a well designed Class A/B amp and cranked the bias current up to
100 Watts Class A, you will have noted no sonic differences between the
Class A/B operation and the Class A operation. OTOH, I have taken crappily
designed Class A/B amps and cranked the bias up to high levels of Class A
and found significant sonic improvements from doing so.
IOW: The design is more important than the Class of operation. Class A will
help a bad design and, at best, do nothing to a good design.
--
Trevor Wilson
www.rageaudio.com.au
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