The speaker? Any reason to assume only one speaker, or one speaker system was tried?
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Just a question, how Vinyl wear with age ?
I ask this question because i think all the plastics are more or less parched with time. By example, the lacker we use to groove the records are so sensitive (solvents making microscoping holes while evaporating), that we used to send-the new grooved lacker immediately to the record manufacture with an immediate appointment for the galvanoplasty.
I was asking myself in which conditions the Tesla send in the space could be, today, in the vacuum and under the sun rays.
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I haven't seen any mention of creep here. I knew a graduate engineering
student at Davis who wrote his paper on vinyl creep as a phenomenon in
record wear. I don't have it, but he explained that vinyl would slowly
restore some of its shape over a period of a day or so. The take-away
was that one would not want to play a record again immediately.
Yes, a very real and well studied phenomena. Not my specialty, but I have seen, in the context of audio reproduction, references to this 2013 book, preview available here: Creep and Relaxation of Nonlinear Viscoelastic Materials - William N. Findley, Francis A. Davis - Google Books
Where is SY when we need him 😀.
Substitute any speaker or any number of speakers. No matter what was used my question was did the HF content in the wider bandwidth signal interact with the speaker at HF.
Main difference I heard was more sibilance in the vocals in the lower bandwidth amp if that helps.
I found interesting that many comments about the audible difference with higher slew rates or extended bandwidth report subjective greater sweetness in the reproduction of "acute".
There was a time I used (on female voices and analog) an effect that I designed and build, that was a 1 oct passband enhancer centered at 40kHz . No changes under 20kHz.
Everyone agreed that it made the voices softer and more airy without changing their texture.
Is there a life in the world of ultrasounds, or is it simply an effect of the phases turned in the audible band?
There was a time I used (on female voices and analog) an effect that I designed and build, that was a 1 oct passband enhancer centered at 40kHz . No changes under 20kHz.
Everyone agreed that it made the voices softer and more airy without changing their texture.
Is there a life in the world of ultrasounds, or is it simply an effect of the phases turned in the audible band?
I design my power amps (all of them incl the ones on hifisonix) for 200-250 kHz -3dB BW and slew rates of > 1V/us per peak output voltage.
But that’s my design approach - I’m not going to ge5 into any battles about wether it’s too high or too low. Each to his own.
But that’s my design approach - I’m not going to ge5 into any battles about wether it’s too high or too low. Each to his own.
I’m sitting listening to Ella Fitzgerald on vinyl right now. I’m always amazed at how natural and organic a good vinyl can sound.
I’m about to finish the good bottle of wine I opened at 5:15 pm.
Live in a bubble and enjoy life. That’s my motto.
I’m about to finish the good bottle of wine I opened at 5:15 pm.
Live in a bubble and enjoy life. That’s my motto.
🙂 Bonsai, do-you know/have this masterpiece ?
YouTube
Same thing (multiplying slew rate by >50 factor ;-)
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Some chewy maths in there. Looking at the example pages suggest that the creep happens over some minutes rather than the milliseconds of contact for vinyl, but interesting to throw into the pot.
Not that specific Aretha Franklin, but I have some CD’s covering the 1960’s through to the early 1990’s. What a voice!!
I watched an interview once with a Michael Tilson Thomas, the famous US conductor - SF Philharmonic plus a lot of other stuff- listening to a record of her with tears streaming down his face.
🙂
Or, an enhanced Tr? A boosted leading edge?
JC has maintained that it is one of the reasons LP is better (?) than CD.... wider BW and faster Tr.
But then voices affected as you describe would seem to be phases.
THx-RNMarsh
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How much of the groove is included? Does it include records that have already been played? Does the contact area of my car tires include all the roads they've traveled? Instantaneous (pressure in this case) means zero time slice.
All good fortune,
Chris
In a reflective mood, been thinking about two real gentlemen we've lost in the last year.
bcarso was uniformly kind and helpful to everyone, and helped me often. I owe him a great debt of gratitude.
DF96 was a natural teacher, with a breadth of knowledge rarely found. He didn't suffer fools gladly, and helped me past foolish thinking many times. He expected you to do your homework and show up prepared, then he could nudge you into a clear path. Made it look easy.
We're much poorer for their absence.
Chris
bcarso was uniformly kind and helpful to everyone, and helped me often. I owe him a great debt of gratitude.
DF96 was a natural teacher, with a breadth of knowledge rarely found. He didn't suffer fools gladly, and helped me past foolish thinking many times. He expected you to do your homework and show up prepared, then he could nudge you into a clear path. Made it look easy.
We're much poorer for their absence.
Chris
The time issue can not be left out of the thermal analysis. At a 3 micron contact radius and an average diameter on the LP the contact time is more like 15-20 usec. I still would like to hear from a physicist on the scaling issue. You know the 50ft. woman etc. problem.
Also, I'd like to know what's meant by "contact area" anyway. If I imagine Platonic solids and smooth groove walls, it looks like point contacts to me. So, at small deformations contact area is small, at large deformations (and with wear) contact area grows. Where do they get the number?
The temperature thing would fall out from pressure, but who actually knows something that esoteric? Your plan of attack, looking at the effects of the deformation, seems the only believable path forward.
I wonder if the oft-observed damage from wet play is related to temperature cycling down where the rubber meets the road. Can't think of a test, but you might.
Much thanks, as always,
Chris
The temperature thing would fall out from pressure, but who actually knows something that esoteric? Your plan of attack, looking at the effects of the deformation, seems the only believable path forward.
I wonder if the oft-observed damage from wet play is related to temperature cycling down where the rubber meets the road. Can't think of a test, but you might.
Much thanks, as always,
Chris
If at level matched blind test you found 2 pre-amp or 2 amp sound different, can you guest which specification is different?
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