Two new advances have appeared that - from the design perspectives - are finally addressing issues surrounding the D-A conversion anti-aliasing filtering issues. The Ayre MP series (see http://www.ayre.com/pdf/Ayre_MP_White_Paper.pdf) describes clearly what one of these issues is regarding phase shift and ringing and what they plan to do about it. The Resonance Labs Invicta (see http://resonessencelabs.com/wp-content/uploads/2012/05/InvictaMeasNotes.pdf) describes another issue regarding head room. Hopefully, I will be able to audition these two units side-by-side at an upcoming audio club meeting and report about their audible differences and contributions.
It's too bad that someone has not incorporated both concerns into one unit, but hey, that's what the high end is all about, right? Progress, not perfection!
Over these 28 years, we have come a long way from the first generation brick-wall anti-aliasing filters designed in the original generation CD players. Moving from fingernails on the blackboard to tolerable sound is a huge advance and one that deserves recognition. Hopefully soon, someone will design an A-A filter that addresses these and other unresolved issues, but I believe the recording sampling rate standard is now the big bottleneck (most agree that 16-44.1 was a mistake). With most artists and studios embracing 24-192 and better standards, one day we should see a new generation of players and software introduced as the state of the art spirals upward.
Until then, I'll still have to spin my old vinyl to hear how far digital has to go.
Yours for higher fidelity,
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