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.

6 thoughts on “LFE: From the Horses Mouth

  • Priece Rich, Jr.

    Hello Mr. Waldrep…I am one who, with limited knowledge of the process, attempts to calibrate my sound system. I do so primarily for movies. Although there have been numerous articles written about “Subwoofer Setup,” the one that I continue to use is from an article written by Tom Nousaine, in the May 2000 Sound & Vision (pp. 87-89). For my environment the current system configuration is ideal (small house, small listening room). I do from time to time adjust the sub depending on the source material. I will say that with your sample that came with my OPPO BDP-83 no adjustments are necessary.

    Nice article, keep up the good work.

    Priece Rich, Jr.
    Dowagiac, MI

    • Hello Michigan…my home state. Thanks for your input. I’m going to be exploring this further…glad the disc is performing well.

  • Humm, the comment about most not calibrating confuses me. Back when I had my high end separate system I would calibrate it with my Shack sound meter. Now that I downsized to a Pioneer AVR I basically depend on the built in MCACC system to handle setup. I believe most users having AVR’s are using and depending on that systems auto-calibrate system to get things right. So is this saying that all of us have subs that are 10db out of calibration when playing one of your blu-rays? Might this also be true of other companies blu-rays?

    • According to the ITU document, DVD-Video discs will always have the LFE boosted 10 dB. It states that DVD-Audio and SACD discs would not be boosted. The real question is whether the manufacturers of AV Receivers actually implement the spec. I think it’s safe to assume that the LFE channel on my DVD-Audio titles is too hot by 10 dB.

  • steviev

    2L boosts its Blu-rays by 10dB on the subwoofer channel, but they don’t boost the SACD subwoofer. They disclose this in the fine print at the end of their liner note booklets.

    It’s funny that your wife unplugged the sub. I unplugged mine about two years ago and haven’t missed it one bit — who needs to rattle the foundations?

    • So Morten’s Blu-rays would have at least 10 dB too much sound….maybe 20 dB too much depending on the AVR or conversion.


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