1966A - are they supposed to be out of phase?

Discussion in 'Cabinets & Speakers' started by DesolationBlvd, Dec 7, 2021.

  1. DesolationBlvd

    DesolationBlvd Active Member

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    I decided to swap the G12T-75s in my 1966A for Greenbacks, and found they were out of phase. Was this intentional or a factory error? In either case, I "corrected" the phase.
     
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  2. junk notes

    junk notes Well-Known Member

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    Intentionally out of phase, of course not and you were right to correct the wiring and properly wire them. good job. :yesway:
     
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  3. Matthews Guitars

    Matthews Guitars Well-Known Member

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    Definitely not. Always in phase, tip to positive speaker terminals.
     
  4. DesolationBlvd

    DesolationBlvd Active Member

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    Thanks. I did install the Greenbacks since they're the match for the Plexi sound of my Studio Vintage.

    The cabinet now sounds much fuller. Before, I had the Weber MicroMASS (so low power only) at 2, now I have to set it at 1 lest I feel like I'm blowing up my apartment.
     
  5. joe_cpwe

    joe_cpwe Well-Known Member

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    Am planning to pull the 75s out of my 1966a also. It's ok, not great. I have V-Type I'm planning to pair with a Greenback (which I still haven't purchased) I wonder if mine is currently out of phase....
     
  6. junk notes

    junk notes Well-Known Member

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    Cool that you guys have this model cab. Guessing that they are the later cup handles, the earlier JCM800 models were comparable to the newer 2061C without the magical soundpost.

    [​IMG] [​IMG]
    Solid cab, and a nice fit for the newer Marshall Studio Series amps!
     
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  7. joe_cpwe

    joe_cpwe Well-Known Member

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    My 1965a has a '87 Marshall 3203 head on it, which is the right match. My 1966a has Jet City JCA-22H on it. The 1965 and 1966 are a great size for lots of different 20 watt heads, Marshalls and more.
     
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