wrote in message
ups.com...
Dave Plowman (News) wrote:
In article ,
Trevor Wilson wrote:
The fact that the amp hums, suggests extreme incompetence on the part
of
the constructor. It SHOULD be deathly silent.
That occurred to me too. What's the reason - penny pinching?
--
*He who dies with the most toys is, nonetheless, dead.
Dave Plowman London SW
To e-mail, change noise into sound.
The hum has been attributed to a PCB fault or damage.It would probably
be easy to fix but the builder has much better things to do with his
time than hunt around for the cause.I will have a tech look into it
later.
The other chip amp [Sonic Art] is very quiet.
It would be hard to imagine a less suited speaker to a chip amp than
TTs Equinox-with its many drivers,crossover complexity and low
impedence.Very many substantial SS amps would struggle on these-as the
smaller M.E.s did.That they still sound pretty good with the buggered
one is an indication of the potential of these things on less demanding
speakers.On such speakers their bass and treble is at least up to very
good SS amps of similar power,but as TT says,it is their midrange which
is special.I would add to that their image depth and precision,their
speed and their dynamics[both macro and micro].
**I suggest you read TT's words again. He was impressed with the power
OP
amp (except for the hum issues) on a value for money basis (something
I
have never denied), but felt is was not as good as his ME850. If you
can
manage to read something else into those words, then you are engaging
in
some kind of supernatural practices. Of course, TT can confirm or deny
your assertion.
Trevor I cannot agree that the midrange is most easy to get right.If
anything bass is most easy to get right.Any decent P.A. amp can do
reasonable bass.Even digital ones.
**Points:
* Your power OP amps did NOT get the bass right (see TT's words).
* I have consistently stated that switching amps SHOULD be able to
reproduce
lower frequency information better and more efficiently than any other
amplifier type. It is high frequencies (and low impedances) where
switching
amps run into problems.
* We are not discussing "reasonable bass". We are discussing high
fidelity. IOW: Accurate (20Hz) bass.
* An amplifier which cannot reproduce 20Hz - 20kHz with absolute
fidelity
is not high fidelity. It is something else.
* Midrange IS the easiest area to get right. Bass frequencies are
dominated by power supply and output device constraints (along with VI
limiting issues), whilst HF is dominated by output device speed, VI
limiting and stability/Zobel network constraints. With your
exceptional
technical skills, perhaps you'd care to explain why you think I am
wrong.
I'll wait.
* With small (ie: Limited bandwidth) speakers, a smaller amp can often
sound better than a large amp. Small bass drivers often perform better
with a small, bandwidth restricted amp. Just like a Gainclone, in
fact.
Such an effect can easily be compensated for, by using a filter before
a
large power amp.
--
Trevor Wilson
www.rageaudio.com.au
Soundstage and depth of image
Linear Mode
