Re: OT: diamond making machine for 200,000 dollars on alibaba

Cursitor Doom <cd999666@notformail.com> wrote:

On Wed, 11 Sep 2024 16:52:12 -0400, Ralph Mowery wrote:

[...]

Audiophiles will pay big money for stupid things.  Best example I have
seen is they will pay around $ 100 for about 6 feet of some special wire
to go from the eqipment to the AC receptical.  Little good that does
when there is 20 to 50 feet of cheap copper or even aluminum cable from
there to the breaker box and other junk cable back to the power pole.

 
Very true. Likewise speaker cable. I managed to get *very* many yards of
excellent low-loss 50 ohm millimetre wave coax cable at a very reasonable
price from some audiophool who'd been using it as speaker cable. He must
have had incredible hearing, that guy. ;->

The business of speaker cables sounding different may have had some
passing acquaintance with the truth.  Apparently the crossover networks
in loudspeaker assemblies can present the amplifier with zero impedance
under certain circumstances and may even try to feed stored energy back
into it.

Under those conditions it wouldn't be surprising if the impedance of the
cables and the current-limiting behaviour of the amplifier output stage
produced audible differences, even thouigh tests under 'normal'
conditions, with resistive dummy loads, failed to find any difference.

The cheapest answer is to have a separate amplifier for each loudspeaker
drive unit and do the crossover with active filters ahead of the power
stages.  With amplifier chips being fairly cheap,it is easy to build
them into the speaker enclosures.    For even better results, tailor the
frequency response of each amplifier to suit the particular drive unit
and cabinet.

The only disadvantages of this method are the need to distribute the
signal at low level and to have a power supply to each loudspeaker box.


--
~ Liz Tuddenham ~
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