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2x15" cabinet designs

Discussion in 'Amps and Cabs [BG]' started by Spearhead, Oct 17, 2002.

  1. Im very interested in building a new cabinet for 2, 15" jensen drivers I have. These came off an old Kustom cabinet that was starting make some terrible rumbling noises at loud volumes, most likeley due to a no longer very solid structure (wood glue coming undone, dry rot). I work at a wood shop so building it will not be a problem, but because of my lack of knowledge in this area I intend to just model after a good design. Does anyone have good specs? Also, what could be some parts i could buy to spice it up? I intend to run it off a 200 watt head if that might affect the design. Thankyou for any input you guys might have.
  2. I suggest you use the specs from the old cab since it was probably designed to be a match for those speakers.
  3. Copy the old Ampeg B-25B cab like I did (but don't port it). I wanted a huge combo amp, but you can take my dimensions and lop off the top portion that makes it a combo.

    I went sealed instead of ported because there is no design work involved as far as tuning the cabinet and port to the speakers parameters. The result won't go quite as low in the deep bass, but the sound is actually better and punchier, plus it protects your speakers more since the sealed air serves as a shock absorber. Remember, the SVT 8x10 cab is sealed and does not have tons of low-low bass, and people love its sound. Big sealed cabinets with big speakers is the way to go for good bass sound, I'm convinced.

    I'd say 44" tall x 28" wide. Easiest build would be to use 1x12 pine for the sides, top and bottom, but if you want it deeper than 11 - 1/2" for some reason, use 3/4" ply to make the sides as well.


  4. patrickj


    Aug 13, 2001
    Ellicott City, MD
    Endorsing: Spector Bass Guitars
    simple easy.. i was going to build one.. (I did, but swapped out the drivers for 6 10s)

    24"w x 38"h x 18"deep (external dimensions)

    3/4" plywood gives you 22.5"x36.5"x16.5" inner dimensions. I used 1.5x3 inch studs for bracing all 6 sides. accounting for bracing, ~ 7.25 cubic feet volume.

    speakers: 2 madison 1590s, 2 2.75" dia ports (partsexpress.com) each 5" in length (inside the cab), tuning ~ 25.5hz.

    really slams you with lows..

    correction.. 2x3 (1.5x2.5) studs.. Home Depot had a sale :) heavy box, but they're 'road ready' ;)
  5. Excuse my ignorance, but what exaclty are ports? Are those the holes that allow air to escape? I am actually interested in a deeper bottom warm sound, and so could adding these ports help me in achieving that? If so how would i go about knowing where to put them and how big to make them? Thanks again guys.
  6. patrickj


    Aug 13, 2001
    Ellicott City, MD
    Endorsing: Spector Bass Guitars
    Check out http://www.linearteam.dk/

    The example I gave above is only good for Madison 1590 speakers (www.speakerhole.com).

    If you decide to go with different drivers, check out http://www.linearteam.dk/ .

    http://www.linearteam.dk/newdriver.html - allows you go figure out speakerbox size in cubic feet, and approx. what the sound levels coming out will be..

    http://www.linearteam.dk/ventcalc.html - figures out how 'powerful' your drivers are

    http://www.linearteam.dk/ventcalc.html - use this to figure out your port size/diameter, etc. Placement is largely irrelevant, but width/length are very specific.

    then finally
    http://www.linearteam.dk/unitconv.html - for any conversion you might need help with.

    The first thing you need are T/S parameters for whatever drivers you decide to use. Check out speakerhole.com, or www.partsexpress.com for a selection. Then, just take the T/S numbers provided, and plug them into the programs above.
  7. I doubt the Jensens came with the Kustom cab, standard was JBL D140's or Altec-Lansings (at least that's what I see on the old sales brochure). So the dimensions of the Kustom cab may not necessarily match.

    And the Kustom cab isn't really the best-designed cab in the world. Find an old Sunn 215, THAT'S a solid cab if ya want to copy a good cab design.

    But to be correct you need to match the speaker's characteristics to the cab dimensions. These are called Thiele-Small parameters, and there are many computer programs available--for free even--that can help you.

    I have both the old Kustom and the Sunn cab BTW.

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