bockaudio said:In terms of vintage mics? Of course, the plastic, and all the plastic parts ARE different and aged. Does burn in matter on a new mic is the harder to answer question, and then, is the capsule separate from the electronics in that regard?
I had meant this in context of someone having brought up whatever Klaus could be doing when their new capsule gets “vintage tuned” by him. A bit of a mystery to what that means.
So I just think to the low hanging fruit. Replacing the actual capsule with a NOS one is a possibility, but I am guessing someone might say “hey the numbers on this capsule are different!”. Or not.
But it came to mind that many years ago on the George Massenburg forum, I think he wrote about using a hair dryer (no heat) to test tension. So, again, thinking to “low hanging fruit” of what someone might think to do in order to somehow relax the tension of an assembled capsule, it had me contemplate that maybe he is blasting the capsules with air for awhile.
Or doing some other type of “burn in” level treatment, maybe just sound.
I guess it IS possible to test the capsule to see if the resonant frequency has actually lowered, and if “low end extension” is truly gained.
My understanding is limited for sure, but it seems that lowering resonant frequency also can possibly move the corner frequency up in the high end down to a lower frequency, and maybe into an uglier place.
Maybe even something like the epoxy technique in the original post is happening.
Just as likely it is none of this.
My personal logic with something like this is more like, if I bought a new U67 and it wasn’t satisfactory - and I really thought it was an issue with the capsule - I would probably send it back. It’s plenty of money to spend and I would try to take advantage of the warranty. But to each their own. It gets a bit philosophical.
I think you are right to raise the issue of how much is “burn in” about usage, vs simply the aging of materials. The aging of materials themselves can be pretty significant in some cases, though usage can definitely be a factor other times (hours of tube usage for instance).
I have some Shure 57s and 58s from the 90s that mostly sat in a drawer, and that I think sound much more like US Unidyne III era after aging a few decades. In that case, usage had little to do with it. I don’t have any tests I can show to demonstrate this in an objective way, so take it with a grain of salt I suppose.