I just upgraded my HT to 4 Atoms and a CC-170 with an HSU STF-2 and an Onkyo 601. I was just wondering where I should set my cross-over for the sub at? For the time being I set it for 100 (on the receiver), but I thought I would get some of your opinions as well. Is there a way to tell where you should set it with an SPL meter, or should you just try and use frequency charts, etc.? Thanks.