Hey, this is my spkr! I wish I could see the photos.

Anyway, the reason we must limit the lowbass cutoff is to increase the sensitivity & output while keeping the current LRC dimensions.
The classic spkr trade-offs remain: size vs. lowbass cutoff vs. sensitivity (sens = dB, efficiency = percent, remember that!). Use the LSW for bass. Increased sensitivity + same lowbass cutoff = cabinet too large.
THE PERFECT CENTER SPEAKER: current LRC size + increased output + increased sensitivity + lower THD + higher bass cutoff (mid 50Hz) =
(4) 5.25s + (2 or 3) Neo mids + HET = Super High Output Ribbon Center Speaker = SHORCS.
Hammer(head, pun intended) it home to Big B soon & often. I want it now. I don't care if MSRP is close to $2k. Our RM40s require some serious heat in the center. Who'd of thunk years ago of someone requesting Brian to create a speaker with a higher bass cutoff?