I toyed around with the minidsp a bit. I'm listening to the "flattened" curve now and I honestly think I prefer the sound with the midrange added back in. I will do some more experimenting for now, having a great time down here.
So it appears my Crown was not the culprit of the 7hz rolloff. Now I'm flat to about 6 hz as you can see. Anything lower is really pointless, it's just cool looking at the graphs now, heh. Maybe it's the drivers giving up or something else, not sure. We will see how it looks when the next 4 drivers come into play.
Listening impressions with the clone amp: So far so good. I have it running in 8 ohm stereo with I believe is rated around 2350/channel. Output wise seems very comparable to the Crown XLS5000 in 2 ohm stereo. I've been POUNDING music for the last 20 minutes at crazy volumes and the case is literally cold, lol. (not kidding). Sound quality is awesome too, super clean and tight as expected. More to come, movies next.
Man this setup is fun.