I think "wooferage" is the correct term.

Woofage sounds like something you would stuff into the cabinet for damping.

"Dammit, I have mice living in the woofage again"

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