Diy subwoofer

I want to build a home theater subwoofer. I a budget of less than 500. I want to build a setup instead of get a kit from pe. Any suggestions on where to start and or how?

I would like a 12 maybe 15". I have the room for around 2.5'^3 can bump to 4'^3 at the most and have access to a router, miter and table saws.

I have used the thread search and come up with many ideas. Most threads go over my head (to this point) And aren't very newb friendly. I have checked the stickies as well. I wish there was an intro to DIY subs for newb sticky. Like a beginners guide to building and testing. I am not a big fan of redundant posts but there is so much information on here but nothing that will seems to help START from step one on building my knowledge base. Usually 2 to 3 posts in a thread and software graphs get posted and it seems to go from step 2 to step 42 which skips some valuable 40 steps in between.

I'll check it out. Thanks.

That was the answer I was looking for thanks!

That's how I was with car audio but then again that world was much easier IMHO.

Thanks for the info.

Yeah I have been reading up in there. There are so many options that I will research before I start my build. Want to make it look like a nice end table so my research process will take a while. With having 4 kids at home, when I spend this kind of money I want it to be good for a while at least. So the wifey doesn't flip. She griped about the surround speakers but loved the outcome lol.