At 03:14 PM 7/8/03 -0700, Tim May wrote:
As for hearing heterodyning in 28 KHz and 30 KHz signals, maybe. CD players have brickwall filters to of course block such frequencies. Some analog groove-based systems can have some kind of signal up there at those frequencies, but not much.
Regular vinyl is (was) also recorded with all kinds of filters, too, including the lowpass ones. If you cut vinyl (or metal) through a signal chain that didn't impose the filtering, perhaps the ultrasonics would remain, which is perhaps the analogophiles claim. You would need a special vinyl cutter though. Some of the filtering imposed on vinyl was to not fry the cutter, or otherwise deal with its inertia. (BTW, I thought your Monster USB cable was a prank.. its not.. some folks just don't get digital..)