Aren't passive radiators out of phase?

Passive radiators have to be out of phase but drivers can be wired to make them in phase to compensate for the crossover.

Besides the phase considerations, you should look at the transient response of all vented designs. Passive radiators are the slowest of the slow but can still sound "good" if done right. I much prefer a well tuned passive radiator to that of a port for multiple reasons. Sean
>

I don't understand the nature of the question, other than your possible concern of buying a speaker which you find inferior, due to a passive radiator inegration.
I personally owned Thiel 2.3's, that used Passive radiator, and the things were fantastic sounding from top to bottom!
I do tend to notice, however, that my favorite subwoofer designs DON'T employ passive woofers! Hummmmm...beyond me

Sean (or anybody knowledgable about such things),

At what cabinet size and/or radiator size does hysteresis become an issue? I would think that in a big cabinet or with a big passive radiator, the response of the radiator to movement of the active would begin to lag, resulting in some potentially smeary sound. Is this an issue? Inquiring minds wanna know these things....

will