If you are a fan of the low frequencies produced by bass notes, consider adding a subwoofer to your home theater system. Although your current system probably has a woofer that can produce low- and mid-range frequencies, it is probably not delivering the kind of sexy, full range, high-definition bass sounds that makes drum lines and bass lines come alive. By efficiently moving large volumes of air, a well designed sub woofer not only allows you to hear the bass, it lets you feel it. Subwoofers aren't only for music lovers. They can also amplify the bass notes in a movie soundtrack, making your Netflix experience as dramatic as a trip to the cineplex!

The type of subwoofer you choose depends on your home theater system. Subwoofers are either passive or powered. Passive subwoofers get their power from an external amplifier. If you choose this sort of subwoofer, you'll need to be sure that your amplifier has enough power to sustain the sound of the bass without getting drained. Powered subwoofers are designed with self-contained amplifiers. They only require a line output from the amplifier. This alleviates some of the operating stress on the amplifiers, which will also improve the sound of mid-range frequencies.

In addition to choosing between powered and passive subwoofers, there are a number of additional design options from which to choose. If you decide on a front-firing subwoofer, the sound will be transmitted from the front and sides of the subwoofer's enclosure. The sound from a down-firing subwoofer radiates toward the floor. Some subwoofers also have an additional port that helps force out more air, which further enhances the sound of the bass. Passive radiators can also be added for a 'cleaner' sound.

The best subwoofers have what is known as a crossover frequency of 100HZ. A crossover is a filter that separates the audio signals into frequency bands. In addition to the crossover, you'll need to consider the subwoofer's ample output, which involves matching the size of your subwoofer to the size of your room. When shopping for a subwoofer, ask the sales associate about the subwoofer's distortion rate. While many have a distortion rate of 25 to 30 percent, a rate of less than five percent is optimal. Choosing the best subwoofer may require time and research, but you efforts will be rewarded with quality sound!