Quote Originally Posted by 3db View Post
What's your point? Just because it was done doesn't mean that the higher frequencies are recorded on the commercially available albums. And btw..viny tops out at 100KHz.


I still don't believe in the supersonic sound affecting sound perception unless you have proof from an independent lab. I'm not going take your hot air opinions as fact The energy in the higher frequencies is so low compared to that of the lower frequencies that its "modulation" effect of the lower frequencies is negligible.
When you look at the various bandwidth waveforms of Vinyl, CD, DVD-A, SACD(of the same recording), and ultra high resolution audio, Vinyl has at least the performance of DVD-A and SACD. Not many vinyl products reach that higher bandwidth, but the capacity to do so it definitely there.

What is largely missing from the anti bandwidth crowd is the benefits of hi rez within the audible bandwidth. More air, and better imaging are the biggest benefits. These benefits are audible with the right combination of recording equipment, carrier format, and speakers. The accurate reproduction of instruments with significant high energy components above 20 khz is also a benefit. That means muted trumpets, triangles, glockenspiels, and massed strings sound more natural when ALL of their harmonics are reproduced. The resolution of space(between instruments with acoustical material) and sound-stage depth and width is improved without a ringing brick-wall filter to hinder it. Oversampling and up-sampling filters have their issues, and are never a replacement for more bandwidth in the recording system. Let's face it, microphone technology has come a loooooooong way in the last decade. Fully 60% of my recent purchases of microphones for my studio have over 20 khz pickup capabilities - and the other 40% are used where their sonic attributes outweighed their bandwidth.

E-stat is dead right in his comments. The RIAA has a emphasis and de-emphasis curve applied to both sides of the equation. They are fully complimentary, and does not result in loss of bandwidth. This is solely for bandwidth difficulties for vinyl itself, and takes that burden off of the system. In saying that, I have seen waveforms of instruments with considerable HF information accurately rendered on vinyl.

You really don't need a lot of energy above 20khz to gain the benefits of it. You just need a more relaxed filter response from the reconstruction filter.