subwoofer crossover- lowest is best almost always?

I'm too egocentric to allow digital room management (I'm a live sound tech and an Old Person) for my 2 subs, but luckily the shape of my room (high sloping ceilings with impeccably tasteful furnishings) works well to keep standing waves from polluting my brain…only in the sweet spot however, proven when I've been plastered to the ceiling although I might have imagined that part…in any case one thing I find hard NOT to notice is the fact that all recordings sound different regarding bass response level, and I simply have to turn the subs up or down a little sometimes. That said, I think it's a good idea to change the crossover point from time to time just to calibrate your brain…you can see why it's set at a certain frequency in the first place, or maybe why it shouldn't have been. I tested my main speaker's frequency response in the room with a meter to see what's what and at least initially put the subs at around where the main's bass drops off substantially, but changed to a little lower point as it sounded more accurate (whatever THAT means) to my addled self.

The key is TONAL BALANCE.
Your system is bi-amplified by default using an active sub so the sub volume and crossover point should be set for maximum tonal balance meaning when you can pleasantly listen at widest volume range possible.

OP-

what brand sub do you use? Much will depend on the branding.
Otherwise, 80Hz is a good place to start tweaking to taste.

My crossover is set at 25 hz.  My speaker crossover is 55.  It does not sound like their is hole in the music.  In fact, the opposite.  Piano sounds full and real.  Voices are more intimate sounding.  I know that everyone room is different but I truly believe in almost any circumstance that I have had with sub's is less is more .  I can see why someone would not want one at all. I use a rel strata 3 currently.

My Maggies have almost nothing below 100hz.  I'm crossing over higher for them than any mini monitor I've ever used.