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.

3 thoughts on “Getting to the Bottom End of the LFE

  • Dang Mark I’m glad you seem to be following all this cause I’m completely confused. LOL
    Talking about the .1 channel as a LFE or BOOM channel seems to completely get out of sync with the fact that many if not most average system is using a AVR with a speaker system that uses smaller satellite speakers and a sub-woofer which as I understand it, really is different from a true .1 LFE speaker used with larger near full range main speaker system more like you have with the B&Ws in you studio.
    For myself I may pull out some of my old calibration discs and see where my sub is as setup by the AVR auto, but all I have any more will be two channel sweep recordings.
    I do know that whether listening to DTS blu rays movies, 5.1 concert blu rays or surround faked stereo CD’s the tonal balance of my system sounds reasonably right. I know if my sub was either at + or – 10 db from my satellites that would be something that would jump out at me.
    Sounds to me like there have been so many variables thrown into the mix over that last 10 years that it’s going to be hard for both the hardware manufacturers and music developers like yourself to be sure things are going to come out right in all cases.
    Or maybe I’m just lost in the tech and don’t really understand whats going on, quite possible.

    • In my post on the ITU specs for LFE channels…they describe them as an enhancement when used at home. I believe the AVR makers have punted the ball with regards to LFE and music.

      • I’m also forgetting something. During the AVR MCACC setup it detects and also allows manual selection of whether the satellites are large or small.
        I’m guessing that if they are set to small, the subs handle everything below the desired crossover frequency, plus add in anything existing in the LFE channel and hopefully adjust the ITU boost/cut according to the flag set on the media.
        If speakers are Large they would only receive the .1 LFE info, again using the ITU flag to set for correct source.
        I THINK. LOL


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