Nice... like camo for a fine living room.

I was thinking that a Helmholz resonator tuned for 800 Hz and filled with absorbent material would be useful, but I had trouble finding dimensions that would cooperate.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8