Bass
No it will not damage sub unless its raining or something.
Woofers
YES
Of course!
It combines two channels into one channel making the output for the speakers/sub woofers more powerful. But it is only good to bridge an amplifier if you know the amp is good quality because if its not, it will mess up the amplifier soon.
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.
no they are called accustomass moduals and their way better
In the back pointing at back hatch