I want to put a sub woofer (1 or 2) in the back of my 87 civic 3 door. I can get JL audio, or phoenix gold. My HU is a Panasonic402, and I am using the deck to power the 3 1/2 inch "speakers" in the doors. I can get 2 phoenixgold "tantrum?" 10 inch drivers for $210 CDN. For the sub(s), I don't want to spend more then $320.00 I have heard these 2 subs, and I felt I needed more. Even in small car. I like deep, clean, quality bass, but I also like it loud. I think I should get 12 inch drivers. I know the install is 80% of the sound, and I would like to build the enclosure my self. (Save $$) What tools do I need to cut a simple round hole? How should bulid the thing? I have the tools to cut the MDF or whatever I use to build the box. So I only need to know how to cut a circle. (Well, what I need to do so)Should the box be ported, or sealed? Thanks for any help! I tried the car audio forum, but I can't post, even if Im logged in.