I have one request. My room is 18 x 14 x 8 and I want it loud enough that I'll want to turn it down.
Welcome to a whole new obsession hobby:
I would take that graph with a grain of salt, since the woofer isn't mounted or sealed.
But that is one fugly graph.
And no, you can't fix THAT with eq.
This is a very popular source for parts:
This would probably be perfectly adequate:
This would probably blow you away:
Sorry, but "12" Infinity in the 'hole'" didn't tell me it was sealed.
You can't (or, more properly, shouldn't) boost, so you're looking at 8dB of cuts on the peaks. The dip is too wide for a room null, and I'm no expert on such matters, so I defer to others here, but that would probably sound as bad as it looks.
I used to use the Behringer (which I got as an open box from Guitar Center; I'm pretty sure it's discontinued), and liked it very much, but you're still going to need REW, so start there.
Two USB mics are available that work well with REW. They're mentioned in Jerry's Guide.
Cheap is good.
And a "better" one won't do much more than the DSP. Some automatic systems are easier, but open up their own can of worms.
And, when you start the build - PICTURES!
So you're trying to use the BDP as a midi interface as/instead of a USB sound card? Sorry, but you're above my pay grade at this point.
At least one of us is really confused. You should, perhaps, take this up on the shack's board, and return here when your build proper begins.