Marshall Origin 20c - Put In A 12'' Speaker

Discussion in 'Cabinets & Speakers' started by hi13ts1, Apr 22, 2018.

  1. LCW

    LCW Well-Known Member

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    Not my style of music, but that sounds damn good!!!
     
  2. Ghostman

    Ghostman Well-Known Member

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    That would be my main concern. However, with frequencies up above 150hz, I'm sure the excursion on the cone is minimal at best, even at high volumes.

    Best practice would be to cut out the proper diameter opening.
     
  3. JohnH

    JohnH Well-Known Member

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    Yes, or another workaround could be to find something to stand off the speaker say 2-3mm back from the baffle. Thick felt or closed-cell foam might do it.

    Might not be a problem at all though depending on the speaker.
     
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  4. Ghostman

    Ghostman Well-Known Member

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    There's a whole upper echelon of physics that comes into play with wave propagation through a port like that. My suggestion would to just open up the baffle to accomodate the larger speaker.
     
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  5. SonVolt

    SonVolt Well-Known Member VIP Member

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    ..or get the head version and a 1x12 cab.
     
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  6. Cesar

    Cesar New Member

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    Hello I received mine yesterday. Wonderful tone. Immediately I thought about the chance to set a 12" inch speaker in it.
    Thanks for the post.
    Did you made a video or that?
     
  7. Cesar

    Cesar New Member

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    Hello guys. New here. I put a 12" inch cannabis rex on mine 16" ohm. Just to see what happened I connected the speaker into the output for 8 ohm and it sounds better for me. Why???
    Do I have to get the 8 ohm speaker instead 16? Thanks!
     
  8. Cesar

    Cesar New Member

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  9. olivierlgp

    olivierlgp New Member

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    Great job with the cannabis Rex !
    Is it so tight with Celestion speakers ?
     
  10. olivierlgp

    olivierlgp New Member

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    Do you think a Neo Creamback can fit this enclosure ?
     
  11. primative

    primative New Member

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  12. primative

    primative New Member

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    My 12" swap using 1/2" birch ply. Totally transformed the amp. New JJ tubes helped too. Ill describe the changes and tone after I load the pics.
     

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  13. primative

    primative New Member

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    End of photos
     

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  14. Time Traveler

    Time Traveler New Member

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    I'm interested to Marshall origin 20c, but I want to change the speaker me too , with a 12 speaker greenback, I'm not a expert on such jobs , it's necessary to disassemble the tubes to install a 12 speaker? I'd like some indication on how to act, I'd be grateful.
     
  15. Marmite

    Marmite New Member

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    Hi there...new at the forum and very interested in adding a Celestion V30 to the 20 Origin...what about swapping the speaker from the outside laying the wood -like the uploaded image shows- and adding the tolex/pipe to a frame to avoid the tolex touching the speaker? It´d make the deep of the speaker win a few inches...what you think??
     

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  16. SkyMonkey

    SkyMonkey Well-Known Member

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    Hi @Marmite. Welcome to the MF :welcome: (Love/Hate your username BTW ;))

    Nice first post!

    I am not sure if the V30 frame and magnet are any larger than other Celestion 12" speakers, but your idea could make fitting a 12" speaker easier if internal space is tight or tubes are in the way.
    If you are any good at installing the Grille Cloth (you said Tolex?) you should be OK with your plan.
    Tolex is the 'elephant skin' textured coating on the combo cab.
    The speaker will need a gasket between the back of the frame surround and the baffle.
    I would make the Grille frame removable, using Velcro to secure it, and don't forget a 'Pull Tab' to peel it off again.
     
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  17. Time Traveler

    Time Traveler New Member

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    I'd like to replace the speaker me too , with a greenback g12, you say so i know could replace the front, removing the grill.
     
  18. Marmite

    Marmite New Member

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    Thanks SkyMonkey...and also thanks for the correction grill/tolex!!...BTW I´m from Spain and always seemed funny to me the Marmite´s love/hate relationship of all my english friends...:applause:..

    I used to have a Tech 21 Power Engine and it has the grill cloth in a frame with a velcro...that´s why I thought about it...it could be a nice solution....
     
    Last edited: Oct 18, 2020
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  19. SkyMonkey

    SkyMonkey Well-Known Member

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    I won't hold that against you.

    BTW I am in the Hate camp.
    Marmite is 'The Devil's Smegma'.
     
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  20. SkyMonkey

    SkyMonkey Well-Known Member

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    Sorry. Apparently there is no 'e' in Grill Cloth. :facepalm:
     
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