CAR SUBWOOFERS

Subwoofer Definition:
A loudspeaker designed to reproduce bass frequencies.
Subwoofer Selection Tips
When deciding to upgrade your audio system, adding a subwoofer can produce massive results. Adding volume at sub frequencies is like adding a third dimension to your music. Whether you're considering building a new audio system, or just adding one (or more) subwoofers to your factory system, this addition will give you the single, most significant sonic improvement. Adding even a little bass gives a huge improvement.
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Selecting a subwoofer can be hard. There are a few questions that you should ask yourself before actually running out and buying woofers.
What quality of sound are you looking for?
There are two main camps in the sound world: Sound Quality (SQ) or Sound Pressure Level (SPL).
Sound Quality alludes to just that.. An SQ System generally uses a smaller woofer and requires a smaller enclosure. A sealed enclosure would typically work best for this application.
SPL, alternatively, is for you "Big Bass Lovers."
Sealed enclosures are also referred to as "Acoustic Suspension" enclosures. When a speaker is put in a sealed enclosure, the pressure becomes trapped in the box and restricts the cone movement, so the air inside the enclosure acts as a spring. The tinier the enclosure, the more pressure is exerted against the cone under movement. With a sealed enclosure of predetermined volume, we can also predict the cut-off frequency and Q* of the system.
Sealed enclosures will also forgive minor mistakes in design (up to 10 percent), without major effects on sonic performance.
The real advantage is that they just occupy less space, not to mention they're easier to design and construct. Choosing a sealed enclosure will give you clean and accurate bass with good low-end extension.
Ported enclosures are very similar to a sealed enclosure in construction, but feature an additional opening for an attached port. This allows the rear-radiated energy to be phase inverted (matched in time) and to become in phase with the energy from the front of the speaker cone, essentially doubling the effective cone area.
The main negative with a ported enclosure is that the design and construction are not very forgiving of errors. Unlike a sealed box, you must determine a number of parameters: the box volume, tuned frequency, port area, and port length. But, the advantage is significant -- you'll get more output with the same number and size of woofers.
However, with all of that extra output there's always a trade off. More bass naturally means more space.
You're probably wondering, can a ported enclosure sound as great a sealed enclosure? The answer is, yes, but it's different in that it will have a slight peak around the tuning frequency (35 Hz) and roll off very quickly. Both types of enclosures have true supporters. What you use really boils down to your application and how they load in your vehicle.
How much space are you willing to give up?
Now, that you've determined your music tastes, you'll need to choose which one of the enclosures will fit your needs and your vehicle. Let's review: A) Sealed: Clean, accurate, with a smooth roll off and small to medium sized enclosure or B) Ported: Very efficient, extended output (plays loud), and requires a medium to large enclosure. The decision is yours, but keep in mind that weight and space are at premium in vehicles over the past few years, particularly with the tuner crowd and their traditionally smaller vehicles.
Before you make your purchase, it's also a vital to find out how much air space and what type of enclosure is required for your dream woofers. Most manufacturers will have both specifications for sealed and ported applications. It is possible to find this information on the Internet or through your local dealer.
How much money should you spend?
This can vary according to your personal needs. Many believe that the greater amount you spend, the more bass you'll get. There surely is some truth to that, but I found that a lot of people get hung up on specs that really don't matter. This is a personal decision. Don't believe that spending more gets you more. Don't get hung up on specs that don't matter.
Here are three key subwoofer specifications to look for:
Fs: The frequency at which the woofer naturally likes to
resonate (like a tuning fork). The lower the Fs, the lower the driver will feel natural.
X-MAX: The amount of voice coil windings that overhang the top plate of the magnet assembly. This shouldn't be mistaken with excursion -- they're two unique measurements that go hand-in-hand. In most applications, the greater the number the better. Think of it this way: Woofers behave like giant air pistons; the more the pistons move, the more SPL you'll create.
BL: The "BL" product is a measurement of the force (power) generated by the speakers' motor. The more "BL" product, the more control the woofer will have over the cone.
Does the installation matter?
Yes, the installation is important. In a home system installation, where the installation is essentially plug-and-play, installation accounts for a very small percentage of the sound quality and is pretty hard to mess it up. Most home receivers have everything built into a single unit and the engineers have taken most of the guesswork out. There's no level matching between components and definitely no subwoofer enclosure building. In a vehicle, it's much different -- the installation takes a lot more skill and accounts for about 80 percent of the success of how the system will sound.
In fact, the installation is more import than the product itself. Think of it this way: If you build a house with a poor foundation, the house will always have a poor foundation and will never be able to support the house.
Should you be concerned about safety?
Safety is key and often overlooked. Be sure to fasten your woofers so they don't fly off in an accident. Sadly some people have been tragically killed this way.
If you follow these tips, you too can reap the rewards of Great Bass.

Professor Apex is an Expert In Car Stereo and Car Video. He has more than 10 years of experience. You can find him here: Wholesale'>www.apex-audio.com">Wholesale Car Audio.

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