50W Head + 60W Speaker = Okay?

Discussion in 'The Workbench' started by JM5010, Dec 3, 2019.

  1. JM5010

    JM5010 Member

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    I have a 100W amp. I am going to pull two of the power tubes, run the amp at 4ohms (which will end up running at 8ohms without the outer power tubes) into a 60W 8ohm speaker.

    Basically, a 50W 8ohm amp into a 60w 8ohm speaker.

    Is this okay?
     

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  2. Gene Ballzz

    Gene Ballzz Well-Known Member

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  3. Scumback Speakers

    Scumback Speakers Well-Known Member Sponsor

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    You'll probably be sorry you did that if you turn the amp up past 3-4 on the volume knob.
     
  4. JM5010

    JM5010 Member

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  5. EndGame00

    EndGame00 Well-Known Member

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    Are you running just one speaker?

    Celestion Redback should be fine at lower volume... I believe the Redback is rated 150 watts RMS...
     
  6. pedecamp

    pedecamp Well-Known Member

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    I think you can get away with it as long as you don't crank it too loud. How loud you planning to run it, what is the amp?
     
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  7. JM5010

    JM5010 Member

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    It is a 100W JCM 800 style circuit, so it’s loud as hell. I plan to run it at around 2-3 the dial. Never above 12 o clock.
     
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  8. Chris-in-LA

    Chris-in-LA Well-Known Member

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    If you’re going to buy another speaker, make it another 60 watt. I’ve been running two Vintage 30’s for years with my 100 watt jcm800.
     
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  9. JM5010

    JM5010 Member

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    Problem is I have a 1x12 cab, planning on getting a 2x12 soon...tight on cash...
    I was thinking of throwing in a 100W carvin GT12 or a Seventy 80. Thoughts?

    What would you say is the lowest speaker wattage that is “safe” for a 50W JCM 800 when in overdrive? (meaning preamp overdrive)
     
  10. EndGame00

    EndGame00 Well-Known Member

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    Jet City or Bugera 2x12 cabs are pretty cheap.... they’re pretty good for home or rehearsals... they’re much lighter since they are made of plywood v MDF...
     
  11. pedecamp

    pedecamp Well-Known Member

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    If its any consolation I ran my 50 watt 2204 with a pair of greenbacks so that's a 50 watt cab, I mostly run it at volume 1 at home and in a band situation usually volume 2-3, I use pedals to get my gain. I did speak to Celestion and they assured me it was safe to run it like this as long as I didn't run it too high. Obviously if you crank it up real high the speaker wont handle it for long. I know you know you gotta get a 2nd speaker eventually and run a 2x12 configuration, but for the moment I think you will be ok as long as you don't crank it. :yesway:
     
  12. BftGibson

    BftGibson Well-Known Member

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    i torture a Celestion V type in a homeade semi open often with jmp50

    Into speaker compression lately in the tone factor. Greenback 4x12 really is the classic sound...volume up !! always
     
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  13. ampmadscientist

    ampmadscientist Well-Known Member

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    Start the reactor... Free Mars!
    Know of any good 90W or 100W speakers for the money?

    Can you buy an EVM speaker?
    The overdrive is going to lunch the speaker you have now.
    The speaker should be rated at least 2X the power of the amp.
     
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  14. SkyMonkey

    SkyMonkey Well-Known Member

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    I still like the G12T-100 (Hot 100). I run 2 of them together in my VS65R and 1912, and used to do the same with my old DSL401.
    Fairly neutral speaker to my ears, slightly bassier than the similar sounding G12T-75 by all accounts.

    I also have a 60W G12 Century Vintage in my DSL40CR, but I run it in parallel with a 112 cab with the original V-Type installed.
    Playing at lower volumes or 20W mode the 60W G12 CV alone should last an age.
    Backed up with the V-Type, the pair are bombproof.
     
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  15. JM5010

    JM5010 Member

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    Wouldn’t a 100W speaker be good enough since i am running the amp at 50W with two power tubes pulled? It’s double the power of the amp...unless it’s more brutal when in overdrive.

    Update: According to this post, a 50W JCM 800 2204 puts out 96 watts cranked? Meaning a 100w speaker would be enough for the 50W circuit? http://www.marshallforum.com/threads/jcm-800-actual-power-output.43259/
     
  16. Chris-in-LA

    Chris-in-LA Well-Known Member

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    Yes. A 100 watt speaker will be good enough.
     
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  17. JM5010

    JM5010 Member

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    What about an 80 watt speaker? Thinking of a Seventy 80. Do you know if they sound good with 2204’s?
     
  18. houseofrock

    houseofrock Well-Known Member

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    I second the Celestion Redback. 150 watts.
    Scumback makes higher wattage speakers.
    At least a 100 watts.
    No not the 70/80. There are much better choices.
    two 75 watt speakers would be fine.

    You are also not really benefiting by pulling 2 tubes. Use an attenuator to take the volume down a notch and use the correct wattage speaker. That is what I would do. There is not much volume difference between 50 and 100 watts but by removing 2 tubes you will neuter the tone of that amp.
     
    Last edited: Dec 5, 2019
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  19. Peter McAteer

    Peter McAteer Active Member

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    Rule of thumb says go 100W, but if you're not running it dimed you should be fine with a 60W speaker.
     
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  20. JM5010

    JM5010 Member

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    I never really run my amp past 4 on the master volume when in overdrive. I ended up getting a 100W Carvin speaker, hopefully it sounds good.
     
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