Really?
They fall regarding woffer below 100 Hz, port cuff extends to 50 Hz but fals for 5~6 dB from 100~120 Hz. There are DAC's with Loudness like some offering from RME and some other firm's but they are all two chenel one's as much as I know. There are stand alone crossovers (mostly analog) and then again balanced.
I am sticking to Windows PC with JRiver for the needs of audio and video processing as it is. I never mentioned SVS Pro series but non Pro sealed basic SB-1000 for the price performance ratio. Of course you/he/me will of course need to EQ bass so a little more linear sub response don't mean much (if anything). Plugin the R3 port's and crossing higher is actually a good idea for lots of reasons (half tone port cuff cut down, better early to late sound arrival, less refractions and in generally less room problems, less R3 cabinet resonance on first crossovers point (400 Hz) and in 700 - 900 Hz range). They will still remain narrow (R3) dispersion and will be needed to be aimed at ear (both axis) regarding tweater so so sweet spot won't be wide.
Luckily he have nice big room for mid to far feald (3 to 4 m) proper placement with enough space behind both him and speakers. Would advise to stay at 3 m even with sub's.
Just my thoughts about it.