JCM 1 Watt What speaker to use?

Discussion in 'Cabinets & Speakers' started by randrewrussell, Feb 25, 2021.

  1. randrewrussell

    randrewrussell New Member

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    OK so I bought a JCM 1 watt Marshall head, anniversary? model.
    It is fantastic but...I am not sure I am using the right speaker for it.
    In short I had Marshall 900 100w combo with a 80w? celestion greenback that has been
    fried for years so I just took out the speaker and stuck it in the custom cabinet that
    I got when I bought the amp 1 watt.
    So my question is, am I using the right speaker and if not what should I get.
    Thanks.
    RAR
     
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  2. fitz288

    fitz288 Apprentice Fermi's Paradox Analyst Silver Supporting Member

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    If there's nothing wrong with that speaker, then there's nothing wrong with using that speaker.
    As long as the speaker ohms match the amp output.
    Do you like how it sounds?
    Are you looking for a different sound?
     
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  3. GIBSON67

    GIBSON67 Well-Known Member

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    You're using a "fried" speaker?
     
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  4. fitz288

    fitz288 Apprentice Fermi's Paradox Analyst Silver Supporting Member

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    This is confusing syntax.
    I was assuming you meant to say:

    ~ In short I had Marshall 900 100w combo ... that has been fried for years so I just took out the (80w? celestion greenback) speaker and stuck it in the custom cabinet that I got when I bought the amp 1 watt. ~
     
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  5. Biff Maloy

    Biff Maloy Well-Known Member

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    I have the JCM1. I've never heard of an 80 watt greenback but i suggest either a greenback (25 watt), vintage 30 or a T75.

    But the thing is it's going to be hard to tell you exactly what to use. You can't go wrong with any of them but you are going to have to try them out.

    Best advice is, use a good quality cabinet with whatever you choose.
     
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  6. pedecamp

    pedecamp Well-Known Member

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    Use any speaker you want over 10 watts. Congrats on the new amp :yesway:
     
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  7. Brett336

    Brett336 Member

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    I have JCM-1 head and the combo version. I think the cabinet size is more important. Normally I would not tend to like a 25W greenback with the JCM circuit because it is kind of on the brite side. However, I am running a single greenback in a 22"x20"x12" cab and it is suprizingly how full and well balanced it is.
     
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  8. randrewrussell

    randrewrussell New Member

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    ok I am an idiot. I bought the JTM-1 not the JCM. Sorry. Does that change anything?
     
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  9. Mr. Natural

    Mr. Natural Active Member

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    For the JTM-1, a 25W Greenback would be a great speaker.
     
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  10. Dogs of Doom

    Dogs of Doom Moderator Staff Member

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    also, getting a greenback, that is not high watt, & also not efficient, means that, you can crank the amp & at least tickle the speaker.

    Just figure, part of "the sound", that many people want from the JTM, is the amp cranked & pushing the speakers.

    If you get too high powered speakers, just think, you will only be pushing 1-2 watts into, say a 25 watt speaker. That's barely pushing it. Get a 75 watt speaker, or a 300 watt cab?

    You won't even tickle the speakers.

    The sound will get loud. 1 watt is a lot louder than one might think. But, it will be a cleaner sound, w/o the coloration of speaker break-up.

    If the speaker is efficient, that means it will only get louder, in a clean sort of way. A less efficient speaker means you can push more amp grunt into it, before the volume gets too high.

    Not that it still won't be loud, but, at same level, you'll have more tone coming through.

    The whole idea is to get the best compromise between power, distortion, & the whole dynamics, running, at the desired volume level.

    Finding the balance is the fun. Once you get it there, is where inspiration sets in.

    I'm a fan of the oversized 1x12 cab too...
     
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  11. tce63

    tce63 Well-Known Member Gold Supporting Member

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  12. fitz288

    fitz288 Apprentice Fermi's Paradox Analyst Silver Supporting Member

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    Out of curiosity, you never did clarify what this mystery speaker is from your fried combo. :scratch:
     
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  13. Biff Maloy

    Biff Maloy Well-Known Member

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    Yep. I should've just said a Heritage G12M20 which is what i use for any of them now or the cheaper EVH 20's.
     
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  14. randrewrussell

    randrewrussell New Member

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    Sorry for the confusion. I have an old Marshall 900 combo 1X12 (circa 1993?) that had been repaired many times and then just died on me. It has sat unused for many years but its speaker, a Celestion G12H-100, works fine so I just removed it and put it in the oversized cablnet that I bought with the JTM1. As to the confusion on the "80 watt", well please don't laugh or say "what an idiot" but when I first looked at the back of the speaker, I thought I saw what looked like "80". It wasn't "80" it was 8 and the Ohm symbol. It's what happens when you get old and the eyes go. Sorry.
     
  15. randrewrussell

    randrewrussell New Member

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    What is a Heritage? or EVH? Are they Celestions? How much should I pay for a vintage Celestion speaker that has been "broken in". Thanks.
     
  16. randrewrussell

    randrewrussell New Member

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    Please see my new post. Sorry.
     
  17. randrewrussell

    randrewrussell New Member

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  18. randrewrussell

    randrewrussell New Member

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    I have the oversized cab. Why are they important? Tone I am guessing?
     
  19. randrewrussell

    randrewrussell New Member

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    Sorry for the confusion. Please see my most recent post.
     
  20. randrewrussell

    randrewrussell New Member

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    BTW it's an Avatar Cabinet.
     

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