When choosing to upgrade your car stereo system, adding a subwoofer can produce massive bass. Adding volume at low frequencies is like adding a third dimension to your favorite tunes. Whether you're considering building a new audio system, or just adding or more subwoofers to your factory system, this simple addition will give you the single, most significant sonic improvement. Simply adding even a little bass will make a huge improvement in your overall sound.

I'll never forget my first experience listening to the heart-pumping sound of bass. I was completely amazed that you could actually feel the impact of the woofers. From that instant on, I've been a car audio fanatic.

Some of the popular brands are:

US Amps, Rockford Fosgate, Pyle, Legacy, Pioneer, Power Acoustik, Hifonics, Crunch

What type of sound do you seek?

There are two main groups in the audio universe: (Sound Quality, aka, SQ) and Sound Pressure Level.

Sound Quality refers to just that ? a very linear response that's not boomy and is very controlled, especially when listening to complex music. An SQ System generally uses a smaller woofer and requires a smaller enclosure. A sealed enclosure would typically work best for this application.

SPL, on the other hand, is for you ?Big Bass Lovers.? If you're like me, and like a lot of impact with your music (extended bass response and 3 dB more efficient gain), then you're probably looking for a vented enclosure. The smaller 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.

The real advantage is that they just consume 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 really similar to a sealed enclosure in construction, but feature an additional opening for a vent. 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,

With all of that extra output there's always a compromise. More bass naturally means more space. Generally speaking, vented enclosures will be to be 35- to 40-percent larger than a sealed enclosure.

You're probably wondering, can a vented enclosure sound as good a sealed enclosure? The answer is, yes, but it's different in that it will have a slight rise around the tuning frequency (35 Hz) and roll off very fast. Both types of enclosures have true supporters. What you decide to use really boils down to your application and how they will perform in your car.

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