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My backup MB200 4 ohm question.

Discussion in 'Amps and Cabs [BG]' started by bassman2011, Mar 11, 2013.


  1. bassman2011

    bassman2011

    Aug 25, 2011
    I just purchased a GK MB200 as an emergency backup. I use presently an Ampeg PF500 with 2- PF115HE Stack. Can I use the MB200 on one PF115HE cab which is 8 ohms or do I have to use the Mb200 on both cabs which are 4 ohms. Not very savy with the ohms stuff. This is a senario only if my PF500 craps out at a gig. :help:
     
  2. tbirdsp

    tbirdsp

    Sep 18, 2012
    Omaha, NE
    I have an MB200 and have run it into two 8-ohm Genz Benz Focus 115's. I usually just use one though

    You don't "have" to use it with both, but why wouldn't you? The amp will take the 4 ohm load and more speakers move more air.
     
  3. bassman2011

    bassman2011

    Aug 25, 2011
    I wasn't sure how a 4 ohm amp works with one 8 ohm cab. Does it reduce the wattage or does a 4 ohm amp need to be connected to a 4 ohm cab in order to get its full wattage?
     
  4. All this is covered in the owners manual.
    free download at the GK site BTW.
     
  5. bassman2011

    bassman2011

    Aug 25, 2011
    Maybe someone will have a quick answer for my quick question.
     
  6. KJung

    KJung Supporting Member

    Well, yes and yes. With a solid state amp (versus a tube power section, which behaves differently), the amp will deliver more power to the speaker(s) as the nomimal impedance of the speaker(2) is reduced.

    So, your amp will put out less power with your single 8ohm cab than it would with two 8ohm cabs (which results in a 4ohm load). The only thing you can do wrong is operate that 4ohm minimum amp below 4ohms (e.g., hooking up three cabs, or two 4ohm cabs, or a 4ohm cab and an 8ohm cab).

    In your case, using one of your 8ohm cabs or both of your 8ohm cabs is fine with that head.
     
  7. Lia_G

    Lia_G

    Oct 27, 2005
    It's not a "4 ohm amp." It's an amp with a 4 ohm minimum impedance load. It will work fine with a single 8 ohm cab, although it will output less wattage. It will also do fine with your two 8 ohm cabs, for a 4 ohm load.

    Cheers,
    Liam
     
  8. 5port

    5port

    Oct 14, 2009
    LI,new yawk
    MB200 into 8 ohms = 140W

    MB200 into 4 ohms = 200W
     
  9. bassman2011

    bassman2011

    Aug 25, 2011
    Thanks guys! Your the best! Everybody had something I was looking for.
     

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