John Curl's Blowtorch preamplifier part II - Page 3430 - diyAudio
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Old 6th February 2013, 11:05 AM   #34291
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Originally Posted by fas42 View Post
Is there any theoretical reason why those 2 sound sources won't reasonably match, to a casual listener?
Even at home, our speakers are at the limit, a truck will never beat a formula one.
There is many problems induced by the volume and size of big halls or open spaces. On an acoustic point of view, where echo appears down to very low frequencies due to the waves length/room sizes, due to the necessity to multiply the sources in order to fulfill the power requirements etc...
On a physical point of view, where acoustic pressures needed induces distortions in the drivers due to non linearities of air pressure etc..
Everybody try to make PA systems as good as possible, and, sometimes, it is not so bad.
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Old 6th February 2013, 12:24 PM   #34292
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No, Jack Bybee was loaned by Hughes Aircraft to Richard Feynman to consult on Superconductivity.
Jack Bybee also told me that the test course for the Bentley is a 7 mi straight line, which one mile, in the middle, is timed. They instruct to NOT try any dangerous actions while at these speeds. They also pre-check brakes, etc in advance.
If you do not believe that Jack Bybee could do such a thing, perhaps you should get some facts that disprove him. Personally, I learn from the guy, more than many other's, that's for sure.
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Old 6th February 2013, 12:53 PM   #34293
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No, Jack Bybee was loaned by Hughes Aircraft to Richard Feynman to consult on Superconductivity.
Was that before or after he was hired by Einstein to consult about relativity?
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Old 6th February 2013, 12:54 PM   #34294
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More about Jack Bybee here:
The Jack Bybee NAQ (Never-Asked Questions)
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Old 6th February 2013, 01:15 PM   #34295
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About my super tweeter's joke, i noticed in reviews that they all remark an improvement in basses.........May-be it is an acoustic phase question, as well, or a group delay one ? it would be interesting to explore.
I wonder if the hf energy causes the ear to react by turning it's gain down..I have experienced this effect with 25 Khz ultrasonic sound present.

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He taught Richard Feynman how to drive.
What, a VW microbus?

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Was that before or after he was hired by Einstein to consult about relativity?
No silly, Einstein's wife hired him..

jn

Last edited by jneutron; 6th February 2013 at 01:22 PM.
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Old 6th February 2013, 01:48 PM   #34296
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I wonder if the hf energy causes the ear to react by turning it's gain down.
Clever. I noticed this strange feeling when some oscillations in power amps. A feeling to be kind of deaf, the ears plugged.
The same kind of increase of dynamic we use with level compressors, setting the attack time slow when this HF appears at high transients ?

I read on comments about those super tweeters that when you set a 40KHz sinusoidal signal, you do not hear nothing, but, if you start or stop the signal at full level of the sin, you hear a little noise pick at the start and end. IM products due to the high slewrate ?
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Old 6th February 2013, 02:30 PM   #34297
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More about Jack Bybee here:
The Jack Bybee NAQ (Never-Asked Questions)
"Brilliant" physics of conduction there.
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Old 6th February 2013, 02:54 PM   #34298
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"Brilliant" physics of conduction there.
This is too complicated for you, Scott, keep away.
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Old 6th February 2013, 03:04 PM   #34299
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I find it hard to believe that Feynman felt the need to consult with anyone about anything. Is there evidence for this consultation in any of his books or papers?
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Old 6th February 2013, 03:18 PM   #34300
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No, of course not. It was all super secret.
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