I mean yes if you change the target and also assume very short distances then it all looks easier
I was describing a true reference-level system, ie, one that could handle ANY content and ALWAYS consistently play without audible compression or distortion at minimum 4m. With an additional, reasonable amount of headroom to allow for EQ and varying room issues.
Doing that does reach absurd levels, agreed. That was my point -- targeting those levels in general is silly unless you have a pretty high budget and are very very serious about playing loud.
It also probably shouldn't be done at all, because old THX references aside, 85dB is NOT recommended by most modern standards outside of large commercial theatres. For typical domestic rooms Dolby suggests 78-82dBC(
pg 15 Atmos Installation Guidelines). ATSC is similar.
At that point, the IN-8 should have no troubles.
There can be yes, that's why you need bass management. Otherwise(for multi-channel content at least) you would not need a crossover at all and could just play the LFE with your subs alone.