Limiting a full range driver

I am considering a miniDSP SHD Studio, all digital with no converting to analog, and then sending out to 2 DACs (OKTO DAC 8 to main speakers / Schiit Modius to my 2 15" passive subs). Amplifiers are Benchmark AHB2 for mains and a Crown Class D (750 WPC) to the subs. All on AES/EBU and balanced.

I plan on getting the UMIK-2 (the better one) because the miniDSP also has Dirac that will need measurements. I know the 8" can handle the lows, but does that prohibit the midrange from sounding its best?

Wow, some very interesting posts here. Some are the opposite of others, but I want to thank everyone for their thoughtful and honest opinions. As is usually the case, I will have to try it to find out. Well, at least I have a lot of tinkering to look forward to.

Thank you for the recent posts, but deeper in this thread I did say that I am using subs. They are Velodyne DD15's that both broke (electronics problems) so I ran drivers to banana plugs that I installed on the plate amps. Now I use a stereo Crown Class D amp to power them. The amp is about 750 WPC into 4 Ohm in each channel. The amp has a built in low pass that I have set at 24 db/oct. and at 74 Hz.