BTW, am I wrong or does the P9 have 2 10"woofers? Sounds small for that pricerange. And can the performance of such small woofers be adecuate?
It does have two 10" subwoofers and that's not necessarily a bad thing.
Two 10" drivers have the equivalent radiating area of one 14", but have the advantage of canceling each other's mechanical vibration when mounted in opposition.
Two drivers
can give a smoother in room response. If there is a meaningful distance between them (like there is here), they will be interacting with the room at different points. As a result, their combined output
could result in a naturally smoother response at the listening position.
The only aspect of the subs spec that on paper doesn't seem believable is the 14Hz bottom end claim, that is admittedly quoted without limits (-3dB, -6dB etc). I'm no expert, but I can't see how MS have squeezed a port capable of that tuning into a box that's
external dimensions are 50cm on a side? Their own cut-away shows the port to be straight, so it just can't be long enough.
Audacious claims aside, that doesn't mean it wouldn't be a very good sub. It would have to be, it's head to head with Velodyne DDs.
Russell