Thanks very much for the help, guys. I don't know if there are special challenges in placement of this particular sub (the Hsu), or for that matter just a sub of this size; but even if placement wisdom can be generalized, I'd appreciate a pointer to a reliable tutorial on integration. I mean, they are all over the place, but it sounds like I just shared a link to one with bad info. I am too new at this...I don't know the difference!\n\nHsu's own suggestions in the quick-guide\/manual seem pretty casual and worry-free. Maybe I am making too much of it.\nIf you want precise integration between the subs and the main speakers, you need a way to measure the response. That means getting a measurement mic and measurement software. If you don't need that level or precision, just run some tones and listen for any cancellation that might be occurring. Use something like this tone generator, and listen to frequencies around the crossover point for reduced output. If you sense a reduced amount of output around the crossover frequencies, there might be some phase cancellation occurring. in that case, switching to opposite phase might fix the problem- but more likely, the problem will be a matter of room acoustics rather than phase mismatch, in which case no phase setting can correct that problem. \n\nIf I were you, I would just follow Hsu's placement and setup recommendation. That should get you to a reasonably good sound. After you get on that footing, there are more tweaks you can do, if you care to, but I think it would be getting way ahead of you and potentially confusing to dig into that stuff before you even have your first sub.