PSW550 low pass setting?

BlakCivicSI

I recently setup a set of rm7200's and an H/K avr230. I'm running the speakers the polk way, with the fronts into the sub.. then sub to receiver etc. I've got pretty much everything setup as far as the settings on the receiver such as the speaker settings, "ez-set"(spl calibration), delay, etc. My question is, I understand its mostly preference but I'm wondering what other people with the same or similiar subs/setups have they're low pass adjusted to on the sub. I've tried putting something on with a lot of bass and messing with it but I can't hear a big difference. Just curious how other people have they're setups adjusted. Thanks for any input