LFE vs High-level subwoofer connection, for FIDELITY

If you want the same dynamic signal that's coming out of your amp to be shared by both speakers and subwoofer then there's no question that the high level input is the way to go.

I'd also suggest stacking the subs but that's another topic.

Per bartsw:  Just run room correction. It sees it like any speaker and knocks down peaks like usual.

Sure. First, I suspect that this will not appeal to the OP.  Second, it's easy but can't correct main and sub separately in the overlap region where it needs to (no crossover).  

@toddalin 

There is no real delay.  If you run the sub from the preamp, it’s the same as running it to the amplifier and if you run it from the amplifier it’s about the same as running the speaker. I’m running wireless from my preamp amp and I was worried about lag, but I sure can’t hear it.  Paul McGowan from PS Audio just did a “Ask Paul” videos about this just the other day.

All the best.

@kr4 

but can't correct main and sub separately in the overlap region

It does knock down the overlapping frequencies affecting both the speaker and sub. But it measures the same as using bass management. It sounds just as good but it's soooo much easier not needing bass management and having to throw away $1200 for Dirac. Calibration is also a faster and shorter process. Also, newer subs have their own EQ so you can still manually adjust it separate from the speaker after or before running room correction. Also my B&W subs have defined settings to match the speakers. Overall, there's pros/cons with both bass mgmt and high level.

Easy yes but that's not my experience at all.