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how to get 2 ohms

Discussion in 'Amps and Cabs [BG]' started by jjl5590, Sep 25, 2008.


  1. jjl5590

    jjl5590 Banned

    Mar 28, 2008
    London, UK
    elo,

    just wondering how you get 2 ohms.

    is it four 8 ohm cabs?

    is it two 4 ohm cabs?

    is it a 4 ohm and an 8 ohm cab?

    or can it be three 8 ohm cabs?

    or two 8 ohm cabs and a 4 ohm cab?


    thanks
     
  2. bongomania

    bongomania Gold Supporting Member Commercial User

    Oct 17, 2005
    PDX, OR
    owner, OVNIFX and OVNILabs
    Ohms FAQ. Read it. :)
     
  3. MatticusMania

    MatticusMania LANA! HE REMEMBERS ME!

    Sep 10, 2008
    Pomona, SoCal
    to get 2 ohms you need four 8ohm cabs or two 4 ohms cabs. I believe two 8ohm cabs and a 4ohm cab would also work.

    2) 8ohm cabs = 4ohm
    2) 4ohm cabs = 2ohm
     
  4. jmac

    jmac

    May 23, 2007
    Horsham, Pa
    In a series signal path the resistance is additive. In a parallel signal path the forumla is (R1*R2)/(R1+R2). I hope that helps.
     
  5. pfschim

    pfschim Just a Skeleton with a Jazz bass

    Apr 26, 2006
    SF Bay Area
    you should read the Ohms FAQ that Bongo listed, lots of good info.

    But, having said that, I think the following are correct:

    two 8 ohm cabs = 4 Ohms
    two 4 ohm cabs = 2 Ohms
    4 ohm and an 8 ohm cab = 2.67 Ohms
     
  6. Assuming all parallel, pfschim is correct.
     
  7. Rick Auricchio

    Rick Auricchio Registered Bass Offender

    I won't bother asking "What problem are you trying to solve?"

    You now know how to create a 2-ohm load. As for whether it will solve your problem, nobody knows.
     
  8. jjl5590

    jjl5590 Banned

    Mar 28, 2008
    London, UK
    lol thanks for your replies. im looking to get an SWR 350x head and run it at 2.66 ohms
     
  9. Ah. then we'll see you in the "Amp repair" section.

    why would you plan to run a certain amp load? instead, why not figure what all your possible impedence loads will be with what cabs you have, and then find and amp which can handle all of them?
     
  10. jjl5590

    jjl5590 Banned

    Mar 28, 2008
    London, UK
    i think im gonna get the SWR amp, and have three 8 ohm cabs
     
  11. ok, why 3 cabs?
    i dunno, i guess im just confused why you would need so many speakers, why not get a cab and amp, and then add a cab if you arent loud enough, instead of just overkilling on cabs and running an amp ragged?
     
  12. jjl5590

    jjl5590 Banned

    Mar 28, 2008
    London, UK
    well im a weak armed 16 year old, and i kinda wanna compromise my rig of small cabs. like ive already got a 2x10, then i could get a 1x15 and possibly another 2x10, thus avoiding heavy 4x10s
     
  13. Rick Auricchio

    Rick Auricchio Registered Bass Offender

    That makes lots of sense. Start with a pair of 8-ohm cabs, and if you add another later, you're at 2.67. Adding a fourth cab gets you down to 2 ohms.

    At 2 or 2.67, you have fewer choices of heads; virtually all heads can drive 8 and 4, but not all will go below 4.
     
  14. jjl5590

    jjl5590 Banned

    Mar 28, 2008
    London, UK
    well the SWR can safely run at 2ohms, but it reccommends 2.66 or above to avoid it running to hot
     
  15. herndonbassist

    herndonbassist Low Down Thumper Supporting Member

    Apr 7, 2005
    Herndon, VA - NoVa
    I'd get the 1x15 and run it w/ the 2x10 and THEN decide whether you need another cab. I run a 2x12 + 2x10 setup and it's PLENTY. Just a thought tho.
     
  16. jjl5590

    jjl5590 Banned

    Mar 28, 2008
    London, UK
    nah its definitly gonna be the two 2x10s first. then i will get a 1x15, to feel the bass a bit more (and also it has casters so moving the rig will be easier lol)
     

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