Amp for Apogee Stage's

Muralman1,

I drive my Apogee MiniGrands with a Class A,
Full-Power-Balanced, "cx"-series stereo Krell.

Dr. Gregory Greenman
Physicist

Cjfrbw,

I agree with your last comment that one has to let one's
ears be the final guide.

All I'm saying, is that many tube amps when confronted with
the complex impedance dips of the Apogee ribbons will not
have the current reserves to drive enough current through
the ribbon so that the voltage is what it is supposed to be.

Once the amp can't put the required voltage on the speakers
input terminals - then all bets are off with respect to
accuracy.

Accuracy isn't a limiting concept. The music signal being
sent to the speakers is encoded as a voltage. If the amp
can't put the correct, and I do mean correct; voltage on
the speaker's terminals - then you are doing something
inaccurate to the music.

Now you may like what you hear - but if your amp is not
putting the proper voltage on the speaker's terminals -
then all the great qualities that you are ascribing to the
music - are not qualities of the music - because the
musical signal isn't being accurately represented to the
speaker. Once that inaccuracy creeps in - there's nothing
the speaker can do to correct it.

However, you may like what the speaker puts out - you just
have to accept that it, of necessity; it is something
different than what the musician intended; regardless of
how much you may like it.

Dr. Gregory Greenman
Physicist

morbius,

Krell is a fine amp for solid state. I believe Boulder would better. Both
represent an old technology. The new fast switching technology is sweeping
acceptable standards set by transistor powered amps aside.

Accuracy doesn't just apply to frequency response. Timbre truth depends on
speed as well. You can't hear a string instrument's full character if subtle
sounds made by twisting of the bow is missing. That comes with speed, and
an amp's ability to fully support the loudest, and softest signals
simultaneously. The H2O has that speed, and separation.

Say, what do you think about parallel universes?

Muralman1,

When I say "accuracy"; I don't mean just frequency response.

What I mean by "accuracy" is the shape of the voltage waveform
to the speakers is EXACTLY the same as the voltage waveform
that represents the music.

The frequency response is just the Fourier Transform of this
waveform. However, my definition of "accuracy" is more
detailed than that. In my definition of "accuracy" - the
voltage on the speaker's terminals has to look EXACTLY like
the music it represents.

There are tube amps that can reproduce accurately - depends
on the design and power capacity.

As for parallel universes, I'm afraid I don't delve into
cosmology - think the other end of the spectrum - nuclear
physics.

Dr. Gregory Greenman
Physicist

Vince:

If it's truly parallel, then how do you know it's there?

Jeff