Weren't you just saying that having correction at 20hz is huge amount of processing and could take up all the processing power?
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I would have to loopback the Dirac sweep from rew to see how it handles such a thing, it may not even try.
But if a 20hz HPF was on everything, thatís different. They all share the same shift now. So it really wouldnít need much of anything to sound good.
OTOH to linearize a 20hz HPF would possibly take over 10,000 taps at 48k per channel. So I doubt it would try,
TLDR : donít use a 20hz HPF on sub alone.