Under the “Enclosure Specifications” section, you will notice the fields labeled, “1/4 Wave Tuning Point,” “Port Frequency 1,” “Port Frequency 2,” and “Box Frequency.” In order to achieve the intended alignment model of the formulas in the calculator, you must try. When honestly, 1/4 wave theory is easier than trying to calculate port dimension with no program. Anyone with simple 8th grade- no scratch that, 6th grade level math can calculate tline enclosure dimesnions.
Click to expand.Hi, The following article will give you some rough guidelines for determining speaker enclosure size. There are many such articles at various web sites. Do some searching for more information. Regards, HG 'Speaker Enclosures are more than just wood pieces randomly thrown together and screwing speakers into them.
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The volume and port size and length (if you go ported, which I HIGHLY recommend) is determined by some basic arithmetic involving some of the speakers' specifications, and your taste. The following table gives an approximate volume in cubic feet you need to plan your enclosure for based on the woofer size.
The woofer is the single most important element in calculating your enclosure as it makes 80% of the air or more. Woofer Size --- Enclosure Volume 4' ========.25 -.39 cubic feet 6' ========.35 -.54 cubic feet 8' ========.54 -.96 cubic feet 10' =======.96 - 1.8 cubic feet 12' ======= 1.8 - 3.5 cubic feet 15' ======= 3.5 - 8 cubic feet How you distribute that volume is pretty much up to your needs, just don't make them square! Square enclosures will make awful bouncing frequencies.
You might have noticed that many sound reinforcement speakers have the sides of the box tapered in toward the back, if you can do that, do it. That helps sound move out and not bounce like it does between parallel surfaces. To figure your enclosure size in inches, multiply all the sides as follows height x width x depth, so if your box is 16' x 12' x 8', you have 1536 cubic inches. Take that figure and divide it by 12 three times, so 1536/12/12/12=.89, so, your enclosure is.89 cubic feet. OK, that is the rough volume, to get a more precise figure for the volume of your enclosure you will need two numbers from the specifications of your woofer.
The Q (or, Qts) and the V(as) ratings. The V(as) is usually measured in Cubic feet, but some companies use liters, if this is your case, divide liters by 28.32 to get the cubic feet.
To get the volume, compare your Q rating to the chart below, take the multiplier listed for your Q, and multiply that by the V(as), and that will be the optimum volume of your enclosure in cubic feet. Q ---- Multiplier.2 ====.1.25 ===.25.3 ====.4.35 ===.75.4 ==== 1.1.45 === 1.5.5 ==== 2.0.55 === 2.6.6 ==== 3.5 And there ya go, the exact optimum volume for your speaker enclosure, so just figure out how to best size the enclosure, given your volume, to fit your needs.' These specs can be measured (Vas, Qms, Qes, F3), but you need the equipment to do this. (I read about this back in the 80s in Speaker Builder magazine.) You might try and see if anyone at any forums featuring speaker builders might have these specs, or know how they could be measured. I think the folks at Madisound may have a forum.
It's not even worth trying without having the specs, and then, each cabinet design has its own formula. Likewise, speaker drivers are often designed for specific enclosure types--roughly speaking, a speaker with a loose compliance does best in a sealed cabinet, where stiffer suspensions work well in vented or transmission line systems. Some are even designed for open baflle (enclosureless) designs. Click to expand.Not a big deal.For my homebuilt 3 ways with 12' paper cone woofers the calculated size for a ported cabinet was 3.6 cubic feet.
This conforms to the chart which I provided. If you error on the high side of this chart, you won't be disapointed. If your speakers have paper cones, I would use a size of 3.5 cubic feet.