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Old 7th November 2002, 10:10 AM   #1
Raka is offline Raka  Europe
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Default Air compression

Hi all,


I have a question for Mr. Pass

I read your explation about the sound trip through air, and the air rarefractation and compression, and I have to say that is very encouraging and suggestive, not to mention true and exact.

But after I while I started to think: That way is how "real" sound travels from instrument to microphone!! For synth music (i.e. music that only reaches air after getting out of the speakers), could be effective, but for "natural" or "acoustic" recorded music (i.e. music that has already had the trip and the effect of comp. and raref. from the air) I don't see the reason!!

I take the opportunity to say that I love your work, mainly the writing and the essence (because I haven't finished my Alep30 yet), and above that your PWOL (pass way of life: not even one of my company engineers of my dept. shares their ideas with anyone. That is... like you)

Thanks,
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Old 7th November 2002, 07:12 PM   #2
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The notion of air being single-ended simply leads me
to try single-ended amplification as a path to the sound
of electronics which best mimic natural phenomenon and
whose distortions are likely to be least offensive.

If you don't like this idea, I've got others....

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Old 7th November 2002, 07:54 PM   #3
SY is offline SY  United States
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I've got a theory that everyone has done single-ended wrong. Air is single ended because you can go up in pressure infinitely but can only go down 14 psi or so. With an N-channel FET, NPN bipolar, or a tube, you can go all the way up to the positive rail, but you can only go down to the device's saturation voltage. But remember, what we're dealing with is electron flow, which is negative particles.

So single-ended is a great approach, but everybody has picked the wrong end. It can only sound good if you're using a P-channel FET or a PNP bipolar. N-channels, tubes, and NPNs all exacerbate the single ended nature of air and are fundamentally wrong. It's like sucking across my flute's blowhole instead of blowing. It's like hitting a bass drum from the inside, using a clever midget with earplugs and a score. It's like dragging a violin across a bow.
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Old 7th November 2002, 08:03 PM   #4
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??? Isnīt it pure arbitrariness to name this little bits of materia e- a negative one? I donīt get your idea.

Another point: as long as the single ended FET has same speed moving araound in both directiones between positive rail and saturation, is it really like air?

And what about temperatur , if i put some air in another pressure in very short time, it will react not only with the pressure i want, it will vary its temperaure. What should the poor e- do? become hot or cold???
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Old 7th November 2002, 08:05 PM   #5
SY is offline SY  United States
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Well, in P-channels, you move holes. What does a hole weigh?
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Old 7th November 2002, 08:10 PM   #6
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Default It can only sound good if you're using a P-channel FET or a PNP bipolar.

Try reversing the polarity of your speaker wires....... I guess that it also depends on the phase in the recording. Maybe a phase switch is in order.

http://half.ebay.com/cat/buy/prod.cg...=1856&ad=55327

http://www.vansevers.com/Notes/Phase/phase.html

Now if you will excuse me, I have to go change since I wet my pants laughing.....

Turn the ship upside down Unk,
Fred

P.S. Hi Clark (the one of the right wing)
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Old 7th November 2002, 08:14 PM   #7
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Default What does a hole weigh?

it depends on the enviroment it is in...(although weight is the wrong term...what is a hole...well...it's where an electron isn't)

and I think the concept you are referring to the "effective mass"

solid state...solid state.....that was over 20 years ago

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Old 7th November 2002, 08:17 PM   #8
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Conveniently, that is what we do with the Zen.

OK Fred, it's time to reveal the identity of the Avatar.
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Old 7th November 2002, 08:26 PM   #9
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I think as long as you p device hasnīt a positronic flow (current) the holes only move if a e- is moved. So the mass you see here is the same as e-.

But why do the mass matters? For the current flow the weight isnīt important, see it as 0. Anotherr thing is if you have a piece of copper the e- are maybe some mm second, in semiconductores they are much faster (i hope i remember right). so they have to change their speed at every connection.
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Old 7th November 2002, 08:28 PM   #10
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Default Phase, polarity and/or directionality.

"Wire has one practical dimension and two possible directions--each having its own characteristic sound."

Can anyone tell in what direction a wire is connected,
by listening to some music flowing through the wire?
How is this possible, if it is?
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