I'm looking for opinions . I have RF-7ll 's for my mains, RC-64ll for the center, and RS-62 for my surrounds. The 7's play down to 30hz, while the center plays to 59hz and surrounds play to 50hz. Where would you cross the sub, 60hz or 80hz? If I decided cross at 60hz do you think that is too low for my center speaker, and surrounds? Thank you I've tried both ways and liked both, but what is the proper cutoff?