Bass
Yes, you can use a 5800-watt amplifier with two 12-inch 1400-watt woofers, but it's important to match the amplifier's output to the speakers' power handling to avoid damage. If the amplifier's power significantly exceeds the woofers' ratings, you may need to be cautious with volume levels to prevent overpowering the woofers. Additionally, ensure that the impedance of the woofers matches the amplifier's output specifications for optimal performance.
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.
In the back pointing at back hatch