Amp Help

Discussion in 'Amps and Cabs [BG]' started by Paul A, May 21, 2001.

  1. Paul A

    Paul A

    Dec 13, 1999
    Hertfordshire U.K!
    Help please!!
    There are 2 output jacks marked speaker on the back of my amp head.
    Does this mean I can plug in 2 cabs of the same impedance?
    Or do i have to alter the impedance selector on the amp?
    It's an old Selmer treble'n'bass 100w tube head.
  2. jcadmus


    Apr 2, 2000
    Hoo, boy, careful here. The answer is, yes, you can hook up two cabs to this amp. But you'll need to ensure that their combined impedance is no lower than lowest impedance the amp will allow.

    Say you use two 8-ohm cabs -- their combined impedance is 4 ohms. If the amp can handle a 4-ohm load, you're fine. If it can't, you could damage the amp.

    The impedance-selector switch should be an indicator -- and you want to make sure that you have it in the proper position to match the combined impedance of the two cabs. I'm led to understand that tube amps want to see a specific impedance -- hence the switch -- whereas solid-state amps can handle varying impedance ratings down to their stated minimum.

    I hope that's helpful. Any of the Tubeheads out there want to comment?