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Reasons to add a Subwoofer to your system:

-Reach deeper in bass than your speakers.
-Nice tone that everyone likes.
-Good for competing w/ your friends on who has a better system.
WHAT IS THE DIFFERENCE BETWEEN PASSIVE AND POWERED SUBWOOFERS?

Powered subwoofers are powered with there own power.  They usually have a circuit board with a little amp on it.  They have a advantage than a PASSIVE subwoofer but they usually cost more that a PASSIVE subwoofer.


Passive subwoofers are powered by the stereo's amp.  It may be considered good if the stereo has a good amp (a good stereo amp is about 200 amps) but usually they are around the hundreds or less.  The PASSIVE subwoofer may hit harder if the AMP of the stereo is high but it will not hit hard at all if it does not.  They are usually less cost than Powered but they are running on the stereo's juice. 
Topics:
Setting up your sub perfectly

Reasons why to add a subwoofer to your system

Difference between PASSIVE and POWERED subwoofers.

How much power should you have for a subwoofer?

Choosing to buy the cheapest but best sub for your money

Other Useful Information
So, How much power of a Sub-Woofer should I buy/Make?

Well the answer to that is how much do you want?  There is no limit on how much power you can have.  The trick is, is how you want your fav. song or music to sound.  The way I like it is like this:

The volume all measure the same... (Watts)

Regular Speaker volume: about 10 out of 25
SubWoofer volume:  about 15 out of 20 (90 watt Sub)
"I got two subwoofers connected to my system, I got a 90 watt and a 120 watt sub.
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*Other Cool Stuff*

Car Audio
1A: Vents for airflow.

A2: Bottom part of sub; Has a hole for extra low frequency flow

A3: Speaker Top

A4: High powered Magnifier (Amp)

A5: If a powered sub the ciruits have a amp plus a tone control citcuits. (Ohms)