The late Allen Wright, who was a well known designer of superb preamplifiers and phono stages, wrote in his "Tube Preamp Cookbook" that he or a panel of listeners could hear changes he made to a circuit that affected response at 750kHz! He also stressed the importance of wide bandwidth. His preamplifiers were typically hybrid designs, using one transistor for gain in his phono stages.
'Life Above 20kh' Research Paper, Harmonics (Overtones)
I happened across this study about sound frequencies beyond 20kh. Harmonics (I prefer the term Overtones)
http://www.cco.caltech.edu/~boyk/spectra/spectra.htm
Aside from the study’s purpose, skimming the text is fascinating, sends my/your inquisitive mind in many directions.
Think about your listening room when reading his extremely detailed measurements to ascertain/eliminate any external contributions to his measurements.
Check out the amount of sound energy beyond 20kh of various instruments, crash cymbals particularly revealing. Jangling keys also a surprise.
The comments about a Piano’s Altered Harmonics including the strings/sound board/floor, I found surprising. I’ve always known how difficult it is to record a piano, this must be part of the challenge.
Even though test subjects say they cannot hear the super tweeter, experimenters could measure that the super-frequencies were detected by ..... , awareness and the brain’s perception ability are different things
..................................
Overtones. ’Analog Gets the Overtones Rght’.
I’ve often said, after a whole lotta years, the only way I can begin to explain why I prefer analog, is ’Analog Gets the Overtones Rght’.
Reel to Reel, my noisiest format, is my most preferred source. LP favored over CD. Tubes over SS. Myself, and ANY/EVERYBODY listening here to comparisons over the years has the same preferences.
More reason to get our ears professionally cleaned!!
Elliott
http://www.cco.caltech.edu/~boyk/spectra/spectra.htm
Aside from the study’s purpose, skimming the text is fascinating, sends my/your inquisitive mind in many directions.
Think about your listening room when reading his extremely detailed measurements to ascertain/eliminate any external contributions to his measurements.
Check out the amount of sound energy beyond 20kh of various instruments, crash cymbals particularly revealing. Jangling keys also a surprise.
The comments about a Piano’s Altered Harmonics including the strings/sound board/floor, I found surprising. I’ve always known how difficult it is to record a piano, this must be part of the challenge.
Even though test subjects say they cannot hear the super tweeter, experimenters could measure that the super-frequencies were detected by ..... , awareness and the brain’s perception ability are different things
..................................
Overtones. ’Analog Gets the Overtones Rght’.
I’ve often said, after a whole lotta years, the only way I can begin to explain why I prefer analog, is ’Analog Gets the Overtones Rght’.
Reel to Reel, my noisiest format, is my most preferred source. LP favored over CD. Tubes over SS. Myself, and ANY/EVERYBODY listening here to comparisons over the years has the same preferences.
More reason to get our ears professionally cleaned!!
Elliott
- ...
- 16 posts total
raul ok, we will remain happily wrong. I agree, the volume level may not be flat, but I am thinking about the TIMING of the fundamentals and overtones of each and every instrument’s sound waves, to their individual fundamental, and all the surrounding notes; even overtones we are unaware of, being ’right’ or ’wrong’ to our brain’s perception. Capturing and re-generating fundamentals and overtones ’right’. I’m no scientist, but I play Sgt. Peppers, CD, LP, R2R, and EVERYONE who hears them on my system pick LP over CD and R2R over LP. Next, I switch from McIntosh MC2250 SS to Tube Amp, EVERYONE picks tubes. Same thing with any content I have in all 3 formats. I can switch SS/Tubes without them knowing what’s what It's not clarity, lack of noise, because LP is noisier than CD and Tape is noisier than LP. It’s not ’warmth’, not ’happy distortion’, what is it? You have my best guess, imperceivably perceived timing. |
Dear friends : For several years now I posted more than one time that human been can listen beyond 50khz and down beyond 20hz because we listen/hear through all our body: hair, bones, skin, etc, etc. Even I posted that we have to have the experience to confirm it and for that we need to listen for at least one hour MUSIC tracks very well know for us seated in NAKED fashion ( only a boxer down there. ) at different controled SPL and inmediatly to that naked session listen same recordings with our normal clothes. This experience is really a learning one and this link says that we really can listen with a more wide frequency range that we can imagine: https://pdfs.semanticscholar.org/e6ed/9ec45208be612a60411e3b527d65b22962d0.pdf So, GO NAKED !! . You have to try it. R. |
movement of instrument/mouth, air, microphone, cutting stylus, moving magnetic material on tape, captured/played back by movement the ’timing’ is ’not quite right’ when you add the step of direct conversion of movement or conversion of captured movement to digits, numbers, good numbers, more numbers, a heck of a lotta more numbers, then read and convert those whole lotta numbers back to movement. what the heck is loz rez, high rez, super high rez all about? |
between two ears alone, on the exact same pulsed signal, the ears, as a pair, have a discernment level that goes well beyond 100khz, with regard to timing resolution, in stereoscopic placement of a ghost stereo signal. (it’s all reproduction and fakery) and, in that, it must occur at the exact correct microsecond and at the exact correct level, with respect to the two signals coming out of the speaker pair. to do so, requires an approximate 250khz plus sampling rate, and zero jitter of any kind. at a signal bit depth of at least 20 bits. currently, we are incapable of recreating/building this. (Jitter) never mind the sound of an orchestra in the same set-up. there is additionally other fundamental problems with digital and BJT and Fet transistors. V-Fet and SIT transistors are the only ones that are useful for human hearing discernment, when it comes to peak functions, and then there is tubes, which are also correct in the critical to human areas of signal reproduction. Analog tape and LP are also correct. Doug sax’s mastering system, BTW, was all tube. For this reason. when digital was conceived and brought into the world, none of this was known or considered. Digital did some of the most critical (to human hearing) things wrong.... as it was, for the most part.. engineered--- not heard. Big mistake. |
- 16 posts total