M-S Decoders?

Discussion in 'Microphones (live or studio)' started by mckojack, Nov 18, 2003.

  1. mckojack

    mckojack Guest

    Anybody know of a reasonably priced outboard M-S decoder box with line level(+4)XLR ins/outs?

    AEA sells one that has some extra tweaks(width control, etc.) but it runs at about $600 list.

    I've seen some partial circuit designs posted. They seem fairly simple, but they've been either unbalanced or incomplete.

    Any thoughts?
     
  2. RecorderMan

    RecorderMan Distinguished Member

    Joined:
    Mar 28, 2001
    any three channels with polarity reverse on one and the ability to pan will decode M/S (analog or digital)...when spend money on a dedicates matrix?

    Formula:

    M channel: Pan center.
    S channel number one: Pan left; polarity normal
    S channle mult( a copy or mult of the S channel): Pan right; polarity reversed.

    So, M is up the middle and gives you your mono center/image. The Left S+ and right S- channels give you your stereo/side information.
    Play with the balance, though the combined S+/S- channels can start around -3db relative to the M channel.

    [ December 02, 2003, 12:28 PM: Message edited by: RecorderMan ]
     
  3. mckojack

    mckojack Guest

    Is that all there is to it?

    Are there any benefits of a stand-alone matrix?

    Thanks.
     
  4. AtticMan

    AtticMan Guest

    The only advantage I can see of a dedicated M/S decoder would be in a live-to-two situation, where you need to get the correct stereo imaging onto tape, rather than decoding it later during mixdown.

    I've only used M/S a coupla times, but in both instances I decoded after the fact using three channels on the desk and hard panning/flipping polarity, as described above.
     
  5. jdier

    jdier Active Member

    Joined:
    Mar 20, 2003
    Location:
    Milwaukee
    Home Page:
    Here is a decent article on the subject along with some links for DIY decoder boxes.

    http://homerecording.about.com/library/weekly/aa112899a.htm
     
  6. Marik

    Marik Guest

    For DIY decoder you can also check PAIA kit at:

    http://www.paia.com/msdecode.htm
     

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