Why do people buy 4 Ohm Cabs ??

Discussion in 'Amps and Cabs [BG]' started by Captain G, Dec 1, 2005.

  1. I hope this isn't a too stupid question, but why do people buy a 4 ohm cabs ? Isn't it best to go 8 ohm, then that way you can add another 8 ohm cab later, to produce 4 ohms, instead of being resticted to just a one 4 ohm, because most amp manufactures don't cater for 2 ohms etc.
  2. Lonnybass


    Jul 19, 2000
    Minneapolis by way of Chicago
    Endorsing Artist: Pedulla Basses
    Because, if you're like me, you own a two-channel power amp that puts out more wattage per channel using a 4-ohm speaker than an 8-ohm one.

  3. That's the case with my Peavey Firebass 700 head. Without two 4 ohm cabs, I wouldn't be able to extract the full 700 watts (@ 2 ohm load) which would undermine my authority in my band and I won't allow that. ;)
  4. mrpackerguy

    mrpackerguy Supporting Member

    Jul 3, 2004
    Madison, Wisconsin
    On a 2 channel amp, you could run two 4 ohm cabs at 4 ohms safely in wither stereo or parallel mode. I run two 4 ohm Acme cabs in parallel at 750 W per channel
  5. specplyrz

    specplyrz Banned

    Nov 11, 2005

    No such thing as a stupid question...only arrogant replys'

    4 ohm cabinets seem to be more of the norm for two reasons....most amps, that is their lowest(optimum) rating and its an easy "load" to drive. Your bigger cabs (810) are all 4 ohms, even some, like my Ampeg 810e, having the ability to "split" the bottom into twin four speaker combos.

    Most, NOT ALL, amps now use a cheaper power supply and a four ohm rating is easier to put high numbers into.
  6. Figjam


    Aug 5, 2003
    Boston, MA
    If you want the most power from one cab, 4 ohms will give you more than 8.
  7. Alot of us also only use that one 4ohm cab. so the adding of a second one isn't really an issue.
  8. Tash


    Feb 13, 2005
    Bel Air Maryland
    My cab is 4 10s and a 15 in one box, is about 3.5 feet tall and weighs close to 150lbs. There's no freaking way I need or could use a second cab in addition to it. Making a cab like that 8ohm would be pretty idiotic.
  9. billfitzmaurice

    billfitzmaurice Commercial User

    Sep 15, 2004
    New Hampshire
    Owner, Bill Fitzmaurice Loudspeaker Design
    As evidenced by the previous posts a common misconception is that having a lower impedance will allow you to play louder, and for that reason many buy 4 ohm cabs.

    The fact of the matter is that woofers in general won't put out any more sound at full power than they will at half power, due to power compression. That being the case, if you have an amp which is undersized, being able to put out only as many watts as the speaker is rated for at 4 ohms or less, then a 4 ohm cabinet is in order. But if your amp is rated at 8 ohms equal to or higher than the speaker's wattage rating then there's no particular advantage to a 4 ohm cab.


    Jan 25, 2005
    Phoenix, AZ
    I believe someone ordered a list.......


    Here you are, my friend. I consulted this list (compiled by "The Dude") when I went out looking specifically for a 2 ohm head.

    My Kustom GrooveBass 1200 is the piece that makes my rig go....

  11. Helstar


    Nov 26, 2005
  12. Daytona955i


    Feb 17, 2005
    Albany, NY
    I could run 4 4ohm cabs with my B4R. (500 watts per side)
  13. jokerjkny


    Jan 19, 2002
    NY / NJ / PA
    smaller footprint, and massive wattage eating capability. :)

    but usually best w/ inefficient cabs i.e. Acmes to pull the most sound out of them thar boxes.
  14. jokerjkny


    Jan 19, 2002
    NY / NJ / PA
  15. Dr. PhunkyPants

    Dr. PhunkyPants Guest

    Aug 11, 2002
    It's funny, earlier today I was just thinking "How come every freaking cab I own is 8 ohms? Why are there so few 4 ohm cabs?"

    This is because my smallest amp head puts out max power at 4 ohms and I'll never run this head with two cabs!

    Also, my biggest cab (aguilar GS410) is also 4 ohms because I'll never need more than a 410 without going to the house.

    Bottomline--anyone who only uses one cab needs 4 ohm cabs.
  16. Dr. PhunkyPants

    Dr. PhunkyPants Guest

    Aug 11, 2002
    I was distroted once. Couldn't sit normal for a week.
  17. I have a 4 ohms cab because i don't want to ruin my back anymore and take the full wattage out of my amp. Moreover, I have a small car and can't put a 410 + 115 plus Bass head + Mixing console+ cables and effect flights and the PA to go to a gig.
    And oh... damned, i forgot my bass...:D
  18. Crockettnj


    Sep 2, 2005
    North NJ

    what he said
  19. Cougar207


    Jun 17, 2005
    St. Charles, MO
    Negative, it all depends on what your amp is capable of. If your amp is capable only of an 8 ohm load then you need an 8 ohm or higher cab. If you have an amp capable of a 1/2 ohm load...then you just about run anything except a dead short. :cool: Keep in mind what Bill said about the power of your amp and in addition remember that speaker power ratings can be measured a varity of ways (ever seen a 1500 watt 12" car woofer?).
  20. dcr

    dcr Supporting Member

    The last four amps I've had would either go to two ohms OR would run two 4-0hm cabs in stereo.

    The last 3-4 cabs I've had have all been 4 ohms, including my two current Schroeders and my tilt-back wedge.