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- 5.5IN SPEAKER ENCLOSURE DESIGN PLANS HOW TO
- 5.5IN SPEAKER ENCLOSURE DESIGN PLANS DRIVERS
- 5.5IN SPEAKER ENCLOSURE DESIGN PLANS DRIVER
Moderate Fs, medium mass, and high compliance (Vas,Cms) optional Low Fs, high mass, and high compliance(Vas,Cms) There are set criteria for bass alignment: This is a must, from this data you will determine if the woofer will work in a sealed cabinet, vented, and total volume of the enclosure. The first thing is to determine the complete Thiele-Small parameters, Qts, Qms, Qes, Vas, Fs, Cms, BL, Rm etc… you can determine these parameters by doing complete measurements, in a chamber or there are a few products that specialize as a T&S woofer tester. Well yes there is an exact science to enclosure design.
5.5IN SPEAKER ENCLOSURE DESIGN PLANS DRIVER
Hold the meter 3-5" from the cone of each driver to take the measurements.
5.5IN SPEAKER ENCLOSURE DESIGN PLANS DRIVERS
Play a pink noise recording and measure the outputs of each of your left and right drivers and compare them. If you don't believe me, I would suggest that you buy a sound level meter at Radio Shack and check your own speakers. This imbalance is caused by differences in the speaker drivers themselves, the crossover components, amplifier channel output, etc. It is my contention, that most speakers, both home built and store bought, are not balanced properly. 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).
5.5IN SPEAKER ENCLOSURE DESIGN PLANS HOW TO
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.
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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. "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.