Need help wiring an 8x10 cab

Discussion in 'Amps and Cabs [BG]' started by Tschmu20, Apr 13, 2012.

  1. Tschmu20


    Apr 9, 2012
    Hi guys, I'm about half-way through refurbishing an old 8x10 enclosure, and I need some help getting my wiring figured out. I've done some research, but I haven't found much detailing 8 speaker setups, just 2x and 4x stuff.

    I've got 8 8ohm speakers, and I want to end up with a 4ohm cab. From what I've gathered, wiring in series multiplies ohms, and parallel divides them, so here's where I'm at so far: 2 speakers wired in parallel (4ohms), wired in series to another grouping of 2 (back to 8 ohms), wired again in parallel to the same (totaling 4 ohms).

    Will the wiring diagram I've attached work out that way? Is there a better way to wire 8 speakers? Am I right about any of this stuff? I just want to be sure before I fry anything. Thanks.

    Attached Files:

  2. seamonkey


    Aug 6, 2004
    You got it right, it's a simple equation:
    Let me google that for you))))))

    But seriously, you ask if there's a better way. There is.
    Forget about squeezing every single watt out of the amp.
    Wire it for 8 ohms, and use a crossover so only one column gets all the mids and highs. This will prevent combing in the mids and will likely sound louder all the way around since power isn't lost to combing.
  3. billfitzmaurice

    billfitzmaurice Commercial User

    Sep 15, 2004
    New Hampshire
    Owner, Bill Fitzmaurice Loudspeaker Design
    The options are 1, 4 and 16 ohms. For 4 I'd wire groups of four parallel for two 2 ohm banks, wire the two banks series.
  4. Robby Hoinsky

    Robby Hoinsky

    Dec 28, 2010
    New Haven, CT
    Art of Noise Audio, fEARful™ builder
    Not quite the right methodology, but it seems to have gotten you there nonetheless.

    In series they will ADD (not multiply). Parallel will divide in half only if you have two impedances (i.e. ohms) that are equal. In your case, you'll end up with an 4 ohm load.

  5. Robby Hoinsky

    Robby Hoinsky

    Dec 28, 2010
    New Haven, CT
    Art of Noise Audio, fEARful™ builder
    Another way is to wire both sets of 4 in parallel within the set and the tho sets in series with each other.
  6. Tschmu20


    Apr 9, 2012
    Thanks for the input guys.

    Can you tell me more about this combing effect? I've heard reference to it plenty of times but I don't know what it actually is/does.
  7. will33


    May 22, 2006
    When your speaker are positioned horizontally, and you are anywhere but directly on center with the cabinet, the sound is more smeared than it could be because your ears are different distances from the speakers that are producing the sound, so the sound from each one reaches the ear at a different time. Talking milliseconds here, you can't hear it as 2 separate sources. When this is measured and graphed, the respones line on the graph is choppy....looks like the teeth of a comb, hence the name "comb filtering". Vertical driver alignment fixes that by putting the combing in the vertical plane. You can move a long way horizontally in from of the speakers, but can't really change how tall you are, you're either standing or sitting.

    This happens in PA on a larger scale because of where people are in the audience in relation to the mains, although, the distances are much longer and I read something to the effect of if you can get the combing tight, so each I think 1/3 octave has at least several peaks in it, our brain sort of fills in the rest. Should dig around and find that article again.
  8. Anybody help? tryin to wire a 8x10 cab w/out a crossover or horn..thank u
  9. Hi.

    If You have a tube amp, wire the cab in a way that the last connection is in parallel, NOT in series like some have suggested.
    In a case of an open failure, You don't want an open connection in the OT secondary.

    If it's SS, it doesn't matter either way in MI amplification.

  10. BassmanPaul

    BassmanPaul Inactive

    Thing is that if the cab is Ampeg it will have 32Ω drivers all wired in parallel.
  11. Ric5

    Ric5 Inactive

    Jan 29, 2008
    I like 5, 8, 10, and 12 string basses

    wire 4 pairs in series so each pair is 16 ohms. Then wire the 4 16ohm pairs in parallel and you will get 4 ohms.
  12. The drawback to that method is if one speaker goes out then its paired speaker will not work either. I guess that could also be a good thing since it will be more obvious.

    The alternative is to wire sets of four in parallel and then wire the two sets of four in series, as mentioned previously. With this layout all other speakers will continue to work if one fails. They will even if two or three fail also. If all four of one set fail then none will work but that is not likely.
  13. BassmanPaul

    BassmanPaul Inactive

    Only if the drivers are 8Ω.

    Edit: Better would be wiring each vertical bank in parallel for 2Ω. Wiring the two banks in series will give you 4Ω and if any driver opens, all of the others will keep working.