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How low is too low for actual minimum impedance?

Discussion in 'Amps and Cabs [BG]' started by astack, Apr 29, 2015.

  1. astack


    Nov 12, 2011
    St. Louis, MO
    Question for Andy, Duke, Alex and the other knowledgeable amp / speaker folk.

    How would you feel about a 3x cab with speakers that dip to 7.4 ohms @ 150Hz, so 2.47 ohms minimum? Could you conscionably say it's good to use with any given 4 ohm capable class D head at gig levels?

    As another example, a deltalite 2512 II dips to 5.2-ish ohms at 200Hz, so a 2x cab would be 2.70 ohms minimum. I think there are some Eminence drivers that are a touch lower, but this is one that comes to mind and is a common commercial base model, so it's been proven to not melt amps.

  2. alexclaber

    alexclaber Commercial User

    Jun 19, 2001
    Brighton, UK
    Director - Barefaced Ltd
    What is the phase angle at that frequency?
  3. astack


    Nov 12, 2011
    St. Louis, MO
    It'd be these Fanes, ran full range, sealed.


    I believe I could pull the phase angle from WinISD, but not till this evening. In a sealed box, phase shouldn't get too wonky, IIRC.
  4. agedhorse

    agedhorse SUSPENDED Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    I wouldn't recommend it.

    Having a small amount of sub-nominal impedance isn't as much the problem as the nominal being that low.
    astack likes this.
  5. astack


    Nov 12, 2011
    St. Louis, MO
    10-4, thanks much!

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