1. Please take 30 seconds to register your free account to remove most ads, post topics, make friends, earn reward points at our store, and more!  
     
    TalkBass.com has been uniting the low end since 1998.  Join us! :)

If you put a 4ohm speaker in an 8 ohm cab????

Discussion in 'Amps and Cabs [BG]' started by armybass, Dec 7, 2012.


  1. armybass

    armybass Gold Supporting Member

    Jul 19, 2001
    does that automatically make it a 4ohm cab>

    I am looking at a Ampeg BSE115T. This has an Eminence Kappa 15C 4OHM 450 watt watt driver installed in it and I do not know if anything else was done or needed to be done. Does a single 15 cab have a cross over? Needing to be educated..... thanks.....
     
  2. Tuned

    Tuned

    Dec 6, 2007
    If it has a horn it has a crossover, so the different impedance will move the cut-off frequency of the woofer a bit, but not the tweeter, so it probably won't have a dramatic effect on tone. It may not even have a cut-off circuit for the woofer, not really necessary and it's rather costly.

    The Kappa Pro is probably a more efficient driver than the original so you'll want to turn the tweeter up assuming you use it at all, but beware that it is *a PA driver, not a bass driver*. It does not have a high excursion capability, only 3.2mm compared to the Kappa Pro 15LF's 6.7mm. I would not push your cab with more than 250W. It's 3dB more efficient than the 15LF, so it will perform like a 375W cab, just takes less amp to get there.

    If it's more than $200 don't buy it, you'll have trouble selling it if you don't like it.
     
  3. armybass

    armybass Gold Supporting Member

    Jul 19, 2001
    Wow...what a fantastic answer. Thank you so much for that very informative post. I am getting it as a partial trade and it will either just be come a rehearsal hall cab or given to my son. But thanks so very much. That is the kind of response that makes Talkbass so very valuable!