The room that I have that particular sub in is 23 feet by 52 feet by 8 acoustically- that's 9424 cubic-feet roughly, and yes there is a section that is L-shaped. I isn't about more power, the 500W amp inside the PSW-4000 makes a 3db difference, that's it. I placed my woofer where it would negate the first 2 axial modes (length and width), it is at roughly the
ACOUSTICAL center of the room. For a small sub in a large room- especially in the case of the 3805 or the 2400; where there are some self-diagnostics, put the woofer close to the listening area, like as an endtable or behind the couch- that way you're so close to the woofer that the acoustic energy hasn't dissipated yet- that makes blending the woofer to the mains more difficult but it can work, especially if you happen to have your couch near a boundary (wall).
Kef actually recommends the PSW-2500 with the 9000s, now what type of room that's in is beyond me, but I doubt that they would recommend a sub that performs poorly in most rooms. I'm not in your room, and I don't know exactly what type of levels you're trying to get out of your sub, but I can tell you from almost a dacade of installation experience, and the acoustics training I've gone through that it can be done. A RS spl meter cannot give you the frequency response of your system from 20Hz to 80Hz accurately, and even if it could- how would you know what was the sub versus the sub/room interaction (modes)?
Funny, you didn't quote me when I said that you really need at least a 12" driver to fill a moderately-sized room, and that I prefer to use multiple subs
(4 or more). My mention of the PSW-4000 was in respose to your comment that Kef isn't known for their woofers- well that kind of goes without saying since Kef has only recently put effort into marketing ANYTHING in this country (ads). The 4000 and the 5000 are a step well-above the other woofers from Kef, no doubt. Sure companies like SVS or HSU that only make woofers, can have plenty of performance, but there are plenty of other loudspeaker mfrs that are in the same boat as Kef: Paradigm didn't really make a musical woofer (excepting the servo-15) until the PW-2200, and PW-2500. PSB has 2 worthwhile woofers- their 2 highest priced models, both 15s. M&K has been an exception because most of their woofers were 2-12" drivers in tandem. Jamo (the 3rd largest speaker maufacturer on the planet) has exactly 1 good-sounding woofer, and it doesn't hit 20Hz.
If you want a great woofer; buy the DD-15, or a ContraBass, or 4 Sub Miramars from CAT, or the Krell beast, or Wilson, or Dunlavy- anything else is making a compromise. I'm just trying to be real here- if someone can afford 2700 for a front stage (without stands) msrp- then they can pop for a 1000+ sub too.
Well I don't know many hrs you mean by torturing them but I do know mine were "asleep" for at least 160hrs. After 200hrs they took on another life form. They became SO MUCH more FLUID and transparent anybody can tell. Not only that, I did not have to turn up the volume so much for it to play louder. So 2 things became very apperent: silky -smoother--transparent sound playing at higher levels, no doubt about it. Over at the Brit forums like avtalk and avforum they're experiencing the same thing so I know it's not just just me.
I wasn't saying that you did or did not experience what you say about the 9000s at "200 Hrs" I'm saying that I didn't notice it with mine, that's all .