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Vent Port
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Are you considering purchasing a prefab carport? Before you spend a dime, you should read this article. Are there building codes in your city or county? Do you need a building permit? Had you ever considered that possibility?
Prefab carports are built for individuals who are looking for portability. Prefab carports can easily be moved from one location to another. Prefab carports are typically bolted or screwed together. As such when you want to move the unit all you need to do is unscrew the bolts. The sides and roof are then easily removed in separate sections which can be easily transported from one location to another. Prefab carports are popular with renters because they can easily take the carport with them when they leave.
To ensure the carport is legal, you'd be wise to check the local building codes to see if you'll need a permit before purchasing a prefab carport kit. The vendor should be able to answer your questions and you can expect an honest answer because if they tell you that you don't need a permit when it turns out you do, you're likely to return the prefab carport kit and never do business with that vendor again, right? The fact is though the carports are considered outbuildings in most municipalities and therefore are not subject to building codes.
The prefab carport will not include the foundation obviously so you'll have to handle that yourself. But before you do, make sure you have the carport plans so you know what size to make the foundation. If you already have a foundation and just need the prefab carport, check to see if there are any available prefab carport designs that match the dimensions of your slab. Considering the multitude of carport styles and designs, chances are you'll find a prefab carport kit that meets your needs.
There are many advantages to using prefab carports. Carports are less expensive than buying the materials and building a garage yourself. Building a carport, especially with a prefab carport kit, is much quicker than building a garage from scratch too considering all the parts have been precut to the specified sizes in the factory. There's no guesswork involved when you use a prefab carport kit. The tools used in factories these days are so technologically advanced the pieced fit together like a glove.
You might be able to construct your carport in less than one day all by yourself. Or you may need the help of a few friends. It really depends on the size of your carport. Consider the alternative of spending days, weeks, or months building a garage from scratch and add in the frustration of not having the pieces fit together exactly as you'd like and you'll begin to see how prefab carport kits can save plenty of time, money, and aggravation.
Gary A Milke owns and operates http://www.shopforcarports.com
Basic Mechanism and Growth of the Loudspeaker Enclosure
A loudspeaker enclosure is a cabinet designed to transmit sound to the listener via mounted loudspeaker drive units. The major role of the loudspeaker enclosure is to prevent the out of phase sound waves of the rear of the speaker from combining with the in phase sound waves from the front of the speaker. This results in interface patterns and cancellation, causing the efficiency of the speakers to be reduced; particularly in the low frequencies where the wavelengths are so large that interference will affect the entire listening area.
Most loudspeaker enclosures use some sort of structure, more like a box to contain the out of phase sound energy. the box is characteristically made of wood or, more recently, plastic, both for the reasons of ease of construction and appearance. Loudspeaker cabinets are sometimes sealed and sometimes ported. Ported cabinets allow some of the sound energy inside the cabinet to be released, and if designed correctly with proper attention to phase relationships, both increase bass response and reduce driver excursion.
Many other engineering variations on the basic box design exist, such as acoustic transmission lines. Enclosures always play a significant role in sound production in addition to the intended design effects, adding unfortunate resonances, diffraction, and other unwanted phenomenons. Problems with resonance are usually reduced by increasing enclosure mass and rigidity, by hightened damping of enclosure walls, or by adding absorption internally.
Bass Reflex or vented loudspeaker enclosure
Vented or bass reflex enclosures require special constructions due to the large forces that can be developed by the drivers installed inside that act on them. Vented loudspeaker enclosures have two primary functions - the separation of vibrations from the front and rear of the loudspeakers, and the containment of air so that the air can act as a resonating elastic medium inside the enclosure.
Vented enclosure operation is analogous to the way a bottle will behave as a whistle. In a tuned system it is important to avoid air leaks, since the vent produces most of the sound at the frequency of resonance and the pressure inside the enclosure can be substantial.
Air leaks in the seams or walls of enclosure can cause the tuning of the system to shift in frequency, producing other undesirable effects as well. The material used for enclosure walls should be solid and dense and should be free of voids or warps. The ideal loudspeaker enclosure would have no wall resonance at frequencies that fall within the frequency range of loudspeakers mounted in it. 25 mm solid lead plate would make an excellent loudspeaker enclosure.
Woofer and subwoofer enclosures
Enclosures used for woofers and subwoofers can be adequately modelled in the low frequency region, approximately 100 to 200 Hz and below using acoustics and the lumped component model. Electrical filter theory has been used with considerable success for woofer and subwoofer enclosures.
Conclusion
Before the 1950s many manufacturers did not fully enclose their loudspeaker cabinets; the back of the cabinet was typically left open and early on, it was observed that the enclosure had a strong effect on the bass response of the speaker. Previously loudspeaker enclosures were invented to either wall off the out of phase sound from one side of the driver, or to modify it so that it could be used to enhance the sound produced from the other side.
About the Author
Victor Epand is an expert consultant for music gear, speakers, and microphones. You can find the best marketplace for music gear, speakers, and microphones at these 3 sites: music gear, music equipment, speakers, and loudspeaker enclosures, woofer & subwoofer enclosures.
What kind of enclosure should I make for this subwoofer?
Pioneer TS-W1008D2. I want to know if I should do a sealed enclosure or a ported/vented one. What would be the best dimensions for it. At crutch field it says for a sealed box volume: 0.65-1.25 cubic feet and ported box volume: 0.9-1.55 cubic feet. So is it some measurement in between those numbers.
The type of enclosure is a preference thing really.
A ported box gives good performance with full frequency range that the sub can reproduce.
Sealed makes the sub hit harder with a more restricted frequency range do the the limiting the movement of the cone structure.
Bandpass is the best of both worlds, but takes up about 50% more space. It's basically a sealed back with a ported front.
Use the internal dimensions stated by Crutchfield, but put in some polyfill box stuffing. The internal dimensions give best performance for the sub, and the polyfill helps slow down the sound waves making the sub perform as if it were a bigger box.
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