well, right now, I've got a yamaha reciever, and a HSU VTF2. The crossover is set at 90hz and I feel it's too high. When I had it set up just 2 channel previously, while I was upgrading my speakers, the sub sounded better when I had the internal crossover set around 70-60hz, it seems to me that my mains are better in the 100-70ish hz range than the sub and it lets the sub concentrate on the lower frequencies. Right now I'm using Paradigm Studio 20s for mains, and a studio center, and some jbl S26s for surrounds, so it's not that I need a higher crossoever, but they all have a f3 bottom end at different places, so I can't really just use the internal crossover on the sub.
