Good passive subwoofer?

Oh, another question. Is phase control more important with one sub or two subs, or is it equally important with both?

http://www.audiocircle.com/circles/viewforum.php?f=39&sid=07cac4d51643f2e4f8299ffef0ca7298

This is the VMPS forum, and there are two dealers here that hang out and can provide discounts. The European website is better, as the US one is pretty static.

http://www.vmpseurope.com/

Yes Phase control is important for both speaker for matching with your main speakers. I haven't had to use it as I've been pretty lucky but both subs would need that adjustment and is included on almost all crossovers.

Phase shifts can make a big difference. Without a sub crosover you can shift phase 180 degrees by inverting the polarity at the speaker or amp. Speaker placement is still the most important consideration though.

If your room is symetrical and you can place the subs symetricaly in the room (and still move them about for optimal performance) then stereo subs is the way to go. Most sub controlers are going to shift phase and change levels equaly to both subs.

If your room is not symetrical (or you can't place them symetricaly) you will be better off with one sub placed properly. Plus one sub is about ten times easier to set-up than two.

Good powered subwoofers are easy to set up and sound very good. It helps tremendously to have a patient helper to adjust the controls for you while you sit in the sweet spot.

Good luck!

Just a little to augment Bignerd's thoughts - I suspect you know this trick, but in case you don't - to find best sub location, temporarily put the sub at your seating position, then walk around the room and see where it sounds loudest - that's where you should put it.