Most qulity systems you will remove the screws around the rim, and pull out. If you have a glass case where the subs are inside the box, you will have to remove the glass, then the speaker. Some cheap ones are glued closed, or made out of plastic. In either of these cases throw it away, the speaker or box arn't worth keeping they where not built to last.
No it will not damage sub unless its raining or something.
Automobile speakers and sub-woofers (loudspeakers) are not that difficult to locate. Some box stores like Walmart and Best Buy carry a good range of automobile speakers and sub-woofers.
YES
200 watts
Best Buy and other electronics retailers stock Pioneer sub woofers. The can also be found at Amazon and other electronics retailers on the internet such as Overstock.
its the same year round
One can purchase car speakers and sub woofers from most car accessories stores including Halfords. They can also be purchased online at Argos and Amazon.
No, but it is nice if you want to play loud music.
In the back pointing at back hatch
no they are called accustomass moduals and their way better
yes ,if you want to have it insured when it gets stolen
ground it to the body of the car floor board