What about suggesting to your supervisor of happiness that a nice DD-10 be tucked away in an aesthetically acceptable manner to flesh out the 3100's. The electronic equalization of the sub might help tame room modes, which I assume are a bit of a challenge with a square room.

Cheers, Ian

1: Roon on Mac Studio, G-Drive 10TB, 818v3, 7200.2, UHD722, LG 77G4
2. 808.6, 8kSE
3. 218, 3200's
4: Rivian R1T - 18 speaker 1200W Elevation by Meridian premium sound system
5. G68ADV (croaked), G98DH (also croaked), [HD621, Syles SL-S/PDIF, MD600 (2*4TB), QNAP 469L (4*3TB), MS200], Ayre MX-R Twenties, TBD