Unity = Imagine woofers + Clarus crossover and tweeter.
I have Imagine speakers in a box, but I haven't heard them yet. The woofer does feel cheap with its plastic basket, but they reportedly sound very good, that's why I bought them. My understanding is that Imagine speakers are best to be used in coaxial mode or in an active setup. This is because there is no tweeter attenuation, and tweeter is meant to blend well with the woofer in coaxial install. Once you move tweeter closer to yourself or more on axis there is no way to attenuate it, unless you run active or bi-amp. The unity crossover has +/-3dB options and the tweeter is reportedly more suitable to use on-axis. So in the end, it seems like Unity will probably work better in a passive component setup than Imagines.
If you have extra 2-channels, it's very easy to bi-amp Imagines, this is why I decided to buy them instead of Unity. I will try them first passive, but if I don't like it, I will take the bi-amp route.