I thought LS801p's did not have a "High-Pass" out, simply paralleled outputs to chain more subs -
http://www.yorkville.com/downloads/servman/sm_ls801p.pdf
HA! Looks like you're correct. I sure haven't noticed any kind of cancellation going on and even with the K10s set at full range, this combination has some serious firepower. For this weekend, I think I'm going to keep the config the same and throw the LF switch to "EXT Sub" and see if it makes a difference. I can tell you, adding a dedicated compressor into the chain, and not using the driverack's generalized compressor, made a huge difference. It really cleaned up that sub and tightened it up a lot. Thanks for pointing out my error.