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This looks like a great project for what your wanting to do, but its certainly not a small undertaking and will likely cost quite a lot. Ready made systems can be bought quite cheaply (with varying quality)
My new car came with a powerful subwoofer, speakers all over the place and tweeters that sound great. My new pc came with pretty good amplified speakers that I thought sounded great until today.
Today I heard a tune on the car radio that had strong deep bass. I played the same tune on my pc and couldn't hear the bass. So I hooked up a speaker that I made long ago, heard the strong deep bass in it and remembered about building it and the thrill of it playing really well the very first time. Hobbiests have good reasons to make stuff.