An enclosure does more than simply hold the woofer; it is an integral part of the system. A properly sized and built enclosure can turn an inexpensive woofer into a good performer, while a poorly designed or constructed enclosure will make even the finest woofer sound like mud. There are two main challenges in fabricating an enclosure — making sure it contains the proper volume of air, and controlling the cabinet resonances that otherwise will compete with the sound from the woofer and color its sound.
The ideal volume of an enclosure (length x width x height) will vary depending upon the woofer you select. The enclosure volume for your woofer is usually quoted as internal volume. Therefore, in calculating the overall external dimensions of the box, you must take into account the thickness of the board, the space occupied by the speaker and any internal bracing.
Once you know the internal volume you want to achieve, you'll decide on the dimensions of the enclosure. As a rule of thumb, make sure no internal dimension measures more than three times that of any other. But don't make them too close to each other or you will have a cube — one of the worst acoustic shapes for a speaker.
Finally, determine whether your box will be sealed or ported. A sealed box is the easiest to design and build, and protects the woofer against subsonic bass that can affect its performance. A ported box uses a tube (port) that reinforces the bass produced by the woofer. It can offer excellent, high-output performance, but is more challenging to construct.
I got this information at http://car-subwoofers.blogspot.com
-Audio Car Subwoofers
Buliding Your Own Subwoofer Box
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Wednesday, January 30, 2008
What Is A Car Subwoofer?
Do you know what a car subwoofer is? Would you like to find out? In essence it is a speaker not in a box enclosure ( although they can and are often put in boxes ) with extra power running to it courtesy of an amplifier. The purpose of a car subwoofer is to deliver low frequency bass sounds in the music being played. Usually the octaves consistently delivered by subwoofers are missing from normal range car audio systems with speakers. Some music is specially created specifically for bass and are commonly known as bass tracks.
Not All Car Subwoofers Are The Same:
Basically subwoofers are of either a passive or powered type. A passive subwoofer setup will get its' power from the car audio system. A powered type of setup will get its power delivered independently of the car audio system being used. Car subwoofers are commonly put into box enclosures that they are mounted on and then placed into a suitable place in the car which is usually the boot area. Car subwoofers vary significantly in size with usual ranges being from 8 inches to 60 inches. These days you can pick them up relatively cheap online from places such as ebay.
Audio Car Subwoofer Setup Arrangement:
So far we know most subs are mounted in boxes but they can also come in a tube mounted format. Typically a sub will have an amplifier connected to deliver the power required. The power delivery requirements are significant so for that reason an amp is pretty much a necessity. They also typically take up a lot of space so be prepared to give up that room in order to accommodate your audio car subwoofer. You can find more info on setup arrangements at http://www.subwoofersinformation.com
Buying Your Own Adio Car Subwoofer
Go for the best one that your budget can withstand. If you can't quite afford the good ones in retail outlets then have a look at online auction sites such as ebay. There are some real bargains on there. Remember, buying a used audio car subwoofer in great condition and decent quality could be better than buying a new one that isn't very good. Even though car subwoofers are considered a luxury item, many car audiophiles would not go without this piece of kit in their setup.
-Audio-car-subwoofer
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