Mark Waldrep, aka Dr. AIX, has been producing and engineering music for over 40 years. He learned electronics as a teenager from his HAM radio father while learning to play the guitar. Mark received the first doctorate in music composition from UCLA in 1986 for a "binaural" electronic music composition. Other advanced degrees include an MS in computer science, an MFA/MA in music, BM in music and a BA in art. As an engineer and producer, Mark has worked on projects for the Rolling Stones, 311, Tool, KISS, Blink 182, Blues Traveler, Britney Spears, the San Francisco Symphony, The Dover Quartet, Willie Nelson, Paul Williams, The Allman Brothers, Bad Company and many more. Dr. Waldrep has been an innovator when it comes to multimedia and music. He created the first enhanced CDs in the 90s, the first DVD-Videos released in the U.S., the first web-connected DVD, the first DVD-Audio title, the first music Blu-ray disc and the first 3D Music Album. Additionally, he launched the first High Definition Music Download site in 2007 called iTrax.com. A frequency speaker at audio events, author of numerous articles, Dr. Waldrep is currently writing a book on the production and reproduction of high-end music called, "High-End Audio: A Practical Guide to Production and Playback". The book should be completed in the fall of 2013.

7 thoughts on “Highest Ever Quality Digital Music Format?

  • Andrea

    Which analog-to-digital converters don’t have a brickwall filter when operating at 96 kHz?

  • Grant

    The fact that they are still talking about brick wall converters, just shows how much they are focused on CD bitrates, which is a bit of a giveaway that DXD is born of SACD/DSD even though it is conventional PCM. SACD was focused on CD bitrate multiplication of 32 times 44.1 equals 1411, because it was seen as a better CD — even the name being Super Audio CD.

    They even chose their sampling rate to be “8 times CD” 352.8 instead of the conventional 384 kHz for PCM based on doubling 192.

    It’s all about how much better it is than CD. 8 more bits, 8 times the sampling rate. We’re lucky it wasn’t called DX8CD-D!

    It’s bizarre and unnecessary.

    • Admin

      Thanks Grant…I have to guess that Promates will continue to push DXD because it is their thing. The hype is unwarranted.

  • Van P. Little

    I have seen these advertisements and agree their claims are quite extraordinary.
    Irregardless of the digital encoding, I always wonder just what was the original source format.

    • Admin

      I can say what happened in the Promates recordings…but it really doesn’t matter. I’m in the middle of downloading the DXD file and the 88.2 file of the Neilsen. I’ll do an analysis and listening test and report back. I guess the Promates people won…they got $50 from me.

  • I’ve been reading Dr. Waldrep’s posts for a few years now, and I’ve acquired a fair collection of his and others’ “better than CD” recordings. I’m a retired A/V engineer, so I didn’t just fall off the truck, but one thing I’ve never quite understood about DSD/DXD. Since it’s a “one-bit” scheme, it seems to me (and that phrase ALWAYS leaves room for my education to be improved) that it’s a delta modulation scheme.

    Basically, a delta modulator’s bit tells a counter which direction to count in order to have its value match an analog input value. It was my senior project in college, and while my little 8-bit breadboard would pass spoken word, in 1978 it wasn’t anywhere near what we could call high fidelity.

    So my question to anyone who might know, “Is DSD a delta modulation scheme?”

    Thanks to anyone who responds.

    • Thanks for the post Jim…a couple of quick things. Please don’t associate DSD and DXD…one is a 1-bit world and the other is pure PCM. ANd yes, DSD is a delta sigma coding scheme Ithe articles I posted some months ago on the history of DSD might help).


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