I'd say only with active XO networks is this even worth it. Believe it or not, and I don't believe svs is one, but some speakers with dual posts are connected inside the cabinet! FAKE! Almost like .2 sub outs. Except those are useful... Omg. Well I've had one of my Ultras apart so I know they're legitimately bi-ampable (at least passively). Agree with everything you typed. If you're gonna bi amp, active is the way to do it. I'm not one to tear out the crossovers in my beautifully designed and nicely balanced speaker. One of these days tho, I could see me building a set of speakers somewhere down the road. I think it'd be pretty cool to make a pair from the ground up with intentions of actively bi amping.