mismatched speaker cab question

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by cbstrat, Jan 27, 2012.

  1. cbstrat

    cbstrat Supporting Member

    Sep 12, 2005
    Raleigh/Durham, NC
    a friend of mine told me he was using two cabs with his Carol Ann. 1) 8 ohm and 1) 16 ohm and hooking them up to the corresponding 8 & 16 speaker outs on the head.

    Is this the correct way to hook these up or will it harm the amp?
  2. pdf64

    pdf64 Member

    Aug 9, 2008
    Staffordshire, UK.
    This will result in half the intended impedance being reflected back to the OT primary; may not be an issue unless it's got EL34s and a high VB+.
    Is there a 4 ohm output? If so plug the 8 ohm speaker into the 4 ohm output and the 16 ohm speaker into the 8 ohm output and the correct impedance will be reflected back to the primary.
  3. Carol-AnnAmps

    Carol-AnnAmps Gold Supporting Member

    Sep 29, 2006
    Danville, NH

    Agreed, not ideal, but a lower secondary impedance being reflected back is still better than a higher mismatch. I do know a number of people have done this, but you are putting the amp under more strain and yes, EL34's would show up problems usually before 6L6's. Most of the CA's run a high B+.

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