"A center like the 570 I would crossover somewhere between 50 and 60 hz" (Dedwards).
Besides this center speaker being a typical dynamically low-efficiency design (Reviews measure this speaker at 86db efficiency/about 88 room, and is 5 ohms minimum/under 4 ohms nominal), the reviews and Paradims website list the frequency response limits on this center channel at 60hz+/-
3db, and 65hz +/- 2db! It's basically flat down to 83hz!!
So, if you plan on crossing this speaker at 60-50 hz, you can prepare for a very very weak bass response at the crossover point!!! This is a typical fauxpa by most audio-enthusiests, and should be avoided.
Not only that, but the standard inneficiency of a passive speaker, MANDATES that you get the very demanding bass info to a powered ACTIVE WOOFER, for best results, and dynamic transparancy/impact.
People can argue all they want that their full range audiophile speakers sound faster and tighter in the bass playinf "full range". But the problem lies in the "in-efficiency" of the design! When you play DD/DTS material, that's mixed at 5x's as more demanding dynamically than any recorded music material, and things fall appart real quick with this line of thinking! You get flat sound, dynamically squashed playback, limited dynamics, clipping, and blown drivers...as the amps can't supply the current and control to the drivers through the passive networks! This is standard affair for typical passive hi-fi speaker setups. That's the way it is. If all speakers were active models, with bigger woofers, that wouldn't be the case so much. Heck, even active commercial cinema setup's, with 118db horn designs, still cross over at 80hz to big 15/18" bass woofers!!!! There's a reason THX does this, cause it works!
Still, everything in a balance.
Based on those speakers he's using, and knowing he didn't have a sub right now, I'd be crossing that center over at 80hz, every time, and sending the bass to the mains, yes!
Everything else is going to sucketh. Sorry to inform you.
