![]() If you have ever built a pair of homebrews, you know what I mean! Much more important than exact cabinet size is making certain to add adjustable L-Pads to your mids and tweets to get the drivers balanced properly. Therefore, you will find many speakers in cabinets much smaller than their specs would suggest. The Urbans were built during the era when big was considered better, and therefore, for marketing reasons, a larger cabinet size was more "saleable." The sealed cabinet size is much larger than that prescribed by current standards for it's 12" woofer specs.It is somewhere in the neighborhood of 8 cubic feet!!! Yet they sound wonderful when driven by his MC 30's. Take the Bozak Urbans for example (my son owns a pair). 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.Īnd 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."Ĭlick to expand."Beg to differ" all you want, but selecting speaker cabinet size is not an exact science. 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. 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. Take that figure and divide it by 12 three times, so 2/12=.89, so, your enclosure is. ![]() 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. that helps sound move out and not bounce like it does between parallel surfaces. 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. 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. The woofer is the single most important element in calculating your enclosure as it makes 80% of the air or more. The following table gives an approximate volume in cubic feet you need to plan your enclosure for based on the woofer size. 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. "Speaker Enclosures are more than just wood pieces randomly thrown together and screwing speakers into them. ![]() There are many such articles at various web sites. The following article will give you some rough guidelines for determining speaker enclosure size.
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