wrote in message
oups.com...
If it's so perfected he should go work on some problem that isn't.

High end audio is like a Patek Phillippe or Rolex watch that has a
mechanical movement. Electronic watches that are just as accurate are
available much cheaper so is Rolex a fraud?

The Hafler is an inexpensive, and unexotic amplifier which has been a
workhorse for mid-budget operations and a DIY upgrader's favorite for
years. It works well like (most) all the stuff David Hafler did. But he
was never a high end vendor, he was never a Marantz/Smith/Sequerra or a
McIntosh/Gow or what have you. His products were good value reliable
mid-price products and that's good.

There are several different types of Haflers. You shouldn't characterize
them in one statement. And how can you call one of the first MOSFET output
amps in the world unexotic? It carved new territory!

The original DH series was one of the first MOSFET designs, and suffers from
the so-called MOSFET mist.
The XL-series incorporates a distortion adjustment, the "Excellinear
circuit". Those amps have their adherents.
The Transnova circuit has no relationship to the other two, and was
developed by Jim Strickland when he was the owner/CEO of Acoustat. The
original Transnova amps were built on stainless steel chassis, which,
although this has no effect on sound quality, gives hint of what he aspired
to.

I find the XL series to be an excellent match for most hard-dome systems,
while the Transnova amps do very well with soft domes. System matching is
important, but the result can be extraordinary.

IMHO, the Acoustat design is one of the unrecognized jewels of modern audio;
unrecognized because of a marketing and packaging failure, not because of
the performance.