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Is it okay to push an 8 ohm cabinet with a 4 ohm head?

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  • #16
    Advice I've always followed is to match impedances with valve amps and always use the same or higher impedance as specified with transformer keys (SS) units.

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    • #17
      Jesus suffering ****************. How many times does it need to be explained that mismatching into a higher load can create large flyback voltages that can destroy an output transformer in a tube amp? It will also generate massive screen currents and blow your tubes.



      Edit - not a dig at the op, just people who churn out the same misinformation
      DCC Engineering. Custom Cabs and Effects.






      Originally Posted by -Assy-


      Okay I summed up this entire thread in three posts. Let's go home and beat our children.

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      • #18
        A decent amp can handle 1-up and 1-down without any issues... more than that can be iffy.... but 8 ohm cab with 4 ohm head should be a safe mismatch for most amps.
        http://www.guitarampboard.com

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        • #19
          Ohms don't matter, do what u want........im sure someone will tell you that.
          I endorse Laura & Valve Queen tubes, you should too.Marshall, Gibson, Fender, Charvel/Jackson."I'm happy to pay my tech $40 bucks to take the Zap for me."One kick-butt deal with johnpace2 Dave Friedman of RACKSYSTEMS is a genius.After the Firebird X, i'm quite convinced Henry Juszkiewicz is crazy.Member of the JMP Hall of Fame.

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          • #20
            When i had my Dual Showman it was only able to run at 4ohms, I used a switcher between that and my JMP into a 4x12 at 8ohms and it was fine for years.
            Guitars:
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            2011 Ibanez RG3550MZ Galaxy Black
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            Peavey XXX 4x12 Slant
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            DOD Phasor 401
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            Korg PitchBlack Tuner
            ToneBone Bigshot ABY/EFX
            MKS Pedal Pad II

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            • #21






              Quote Originally Posted by DARKMETL/
              View Post

              I believe this is generally ok. Just makes the amp work a bit harder. I used a 8ohm Mesa .50 Cal head for a long time with a Marshall 16ohm cab with no issues...




              Mesa amps generally don't have this issue because the quality of transformers used. Most other amps, I'd reccomend that the ohms match accordingly. Short answer...depends on amp.
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              • #22
                Another short answer: don't do it.



                Just look at the responses in this and every other thread like it that's ever been posted here. Half the people say one thing, the other half say the opposite.
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                • #23






                  Quote Originally Posted by PlayboyChris
                  View Post

                  Another short answer: don't do it.



                  Just look at the responses in this and every other thread like it that's ever been posted here. Half the people say one thing, the other half say the opposite.




                  I'd believe the people who can produce graphs and don't rely on anecdote
                  DCC Engineering. Custom Cabs and Effects.






                  Originally Posted by -Assy-


                  Okay I summed up this entire thread in three posts. Let's go home and beat our children.

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                  • #24
                    Thanks for the comments, all!

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