I already bi-wired the N802 coming from the Nak. My X30 crossover is at 40Hz before goind to the bass amp then to the 2 acoustic suspended NHT 12" tubular subs (hipass @ 50Hz going to main Nak). My suspicion lie with the ported design of the Nautilus, using backwaves from the bass drivers to create decent bass but just slightly out of phase w/ my A/S subs, proof that as I turn up the x-over bass level control, there was a slight loss of deep bass prior to become louder but muddier as well. Just so you know, my previous set up w/ the 802 FS (acoustic suspension design), I was in bass heaven for nearly 10 years, everything worked great w/ deep tingling bass w/o any boominess, just superb for large orchestral works, I took reading of strong 20Hz output using handheld Radio Shack sound meter while tuning it using test disc. I own a low end Velodyne CHT-12 for the home theater room, augmenting a set of B&W 600 surround speakers, it was decent but no way is as smooth or low distortion as my homemade setup. Thanks for all replies and I will keep working on this problem. BTW, Velodyne has a new DD subs with mike and b/i EQs, I might look into it as well.