John Curl's Blowtorch preamplifier

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#12,241
Andre Visser said:


Are you suggesting that SQ only exist above 15Khz? Your comment shows your ignorance of what was said.
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If anything was ever "silly" the logic behind your flow here is.

Andre please re-read you own post. You, not me, stated that wisdom could make up for "the lost few KHz at the top".

Just tell us how, once you can't hear it because it is "lost", you are going to use wisdom to judge that is is good/bad or anything else?
 
#12,242
john curl said:
This is silly, many experienced older people can still hear subtle listening differences. Apparently it isn't as much a part of extended listening response as many presume. It is also true that when we were younger we were often able to hear better. I used to hear to 24KHz myself, when I was about 20. Forty years ago, at AMPEX, I was asked to find a particular problem in another office, the mechanical engineering group. I heard this ultrasonic oscillation that seemed to be bouncing off the walls. I narrowed it down to a squeaky bearing in a tape recorder undergoing a life test. Most heard nothing at all, some heard something, but indistinctly.
Now, I can't pretend to do that today, but I had a serious audio test on my hearing done recently, and the doctor said that I was just fine for my age. To my surprise, the former mixing engineer for the Grateful Dead and one of the crew and I recently talked together at the AES. IF the presumptions that are made here were accurate, then if ANYBODY should need a hearing aid, it was these two! YET we conversed in a normal tone without electronic aids in a relatively noisy environment. Go figure.
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John

I have also been touring as a sound engineer for several years (did my first gig in 1969) and to be honest I still hear a lot better than the average people do at the same age. That said I have also met sound engineers that has ruined their ears by bad sound.
Hearing damage has almost nothing to do about how loud the sound is as long as it done the right way.

Stinius
 
#12,244
alansawyer said:
If anything was ever "silly" the logic behind your flow here is.

Andre please re-read you own post. You, not me, stated that wisdom could make up for "the lost few KHz at the top".

Just tell us how, once you can't hear it because it is "lost", you are going to use wisdom to judge that is is good/bad or anything else?
Click to expand...

OK, what I was trying to suggest was that one learn to listen to music, detail, ambiance, soundstage etc., when one become older your listening skills should be better even with the loss of a few Khz at the top. Hope it make more sence now.
 
#12,252
Joshua_G, please don't get ahead of yourself. Feedback is a problem, ESPECIALLY when a LOW open loop bandwidth is involved. Keep the open loop bandwidth fairly high, (above 1KHz at least) and feeback can make a 'good' sounding design, if not a 'great' sounding design. Measures better and hides a lot of open loop non-linearity, as well. All my Parasound designs are based on this formula. Vendetta and Blowtorch tend toward open loop.
 
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