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Wood type and thickness for building speaker cab

Discussion in 'Amps and Cabs [BG]' started by Gerard Rizzardo, Jul 16, 2003.


  1. Hi Guys, Could anyone please suggest to me, what is the best type of wood to use for building speaker cabs ?? i.e Plywood or Chipboard.... etc And also, what thickness it should be, so that it is sturdy enough, not to have rattle promlems ?? Plus, should it also be covered with that heavy carpet type material ?? Does it have a large effect on the overall quality of the sound ?? Cheers, Gerard
     
  2. HannibalSpector

    HannibalSpector

    Mar 27, 2002
    Australia
    Apparently MDF is the best from a sound quality perspective because of its density , it doesn't resonate like ply. MDF is one and a half to two times heavier than ply though . So an MDF cab will weigh a tonne.
    Plywood is the strongest and most durable. Thickness would be about 17 or 18mm. CD grade plywood would be fine. If you want a really flash cab a sheet of hoop pine plywood would be nice, it's very nice to work with , takes fastenings really easily , no knots and has a smoother surface. Hoop pine ply is at least double the price of CD structural ply . Depends on how much you want to spend eg 18mm CD - $65 a sheet or 17mm hoop pine $160 a sheet.
    Chipboard would be the cheapest way to build a cab.MDF is similar in price to chipboard.
    Either Mister plywood at Hornsby or Bryunzeel plywood at Brookvale have the best ranges of products.
     
  3. adouglas

    adouglas

    Jun 23, 2003
    Bridgeport, CT
    MDF is commonly used for speakers, but it turns to mush if it gets wet.

    FWIW, Avatar uses 3/4" void-free plywood for its enclosures.

    The carpet covering you refer to is called Ozite, and it's not heavy at all. Nor is it real carpet, as in the stuff you'd put on the floor.

    Check out http://www.partsexpress.com for supplies and info. They've got pretty much anything you'd ever want.
     
  4. MDF does not turn to mush if it gets wet. Particle board turns to mush when wet. There is a huge difference (price and weight) between the two. I've left MDF outside in the California winter (rain) for a couple of seasons without it turning to mush.

    MDF weighs 49 pounds per cubic foot. A 4x8 x 3/4" (19mm) sheet is 2 cubic feet or 98 pounds. Baltic Birch void-free ply and Apple Ply weigh less, typically 32 pounds per cubic foot.

    MDF is less resonant than void free plywood, and much less resonant than construction grade. Large cabs or high performance drivers are better suited in MDF, despite the weight. X-Y-Z plane bracing will help in all but the smallest of cabinets.
     
  5. jdombrow

    jdombrow Supporting Member

    Jan 16, 2002
    Colorado Springs, CO
    Another suggestion is to use a double thickness of wood for the front panel (glued and clamped or screwed together). The extra stiffness will improve the sound, but also increases the weight.

    jd
     
  6. geshel

    geshel

    Oct 2, 2001
    Seattle
    For bass amp cabs, I'd use 3/4" plywood with some nice, light, internal bracing.

    For hi-fi speakers, concrete works well. :D j/k I'd use 3/4" or 1" MDF, double-thick on the front. Using a thick front like that also lets you round the edges and counter-sink drivers more, helping with diffraction issues. Not so much an issue IMO with bass cabs.
     
  7. Toasted

    Toasted

    May 26, 2003
    Leeds, UK
    look at high end cabinets. and even high end combo's. most of them are made from sheet birch, fi you can get it its great :D
     
  8. Petebass

    Petebass

    Dec 22, 2002
    QLD Australia
    Even though Geshel was probably only joking about using concrete, it serves as a reminder that we will always have to deal with a trade off between weight and sound when choosing timber. Personally I'm not fit or strong enough to make my cabs out of MDF. I vote for plywood.

    Thickness depends on wether or not the speaker is dealing with low frequencies. I used 20mm on my 2x10, but it does nothing under 75Hz. I used 25mm on my 15 and that's probably as thin as you would ever go.