Apachef1, it seems you failed to note that I am not interested in pushing those drivers to the limits of their excursion, causing distortion. The realization that I have come to is that even a three-way floorstander is not capable of truly pressurizing a space of this size. Adding "more power" is not part of a solution to the problem I presented both for the reason of driver excursion *and because I'm not desiring higher SPLs*. I never said the music is not loud enough at the listening seat - it most certainly is.
Cancellation between subs and speakers is obviously something that has to be dealt with in setup.
I'm not interested in changing the sound of main speakers, which in general I like, especially by a move as radical as going to horns. I'm confident that's not necessary.
Adding a pair of large subs isn't going to really pressurize this space as happens in a small room either, but it's bound to be an improvement. I'm pretty confident that quality stereo subs carefully setup and crossed high enough to fill in even the 40-80 Hz area is worth a good try.
Cancellation between subs and speakers is obviously something that has to be dealt with in setup.
I'm not interested in changing the sound of main speakers, which in general I like, especially by a move as radical as going to horns. I'm confident that's not necessary.
Adding a pair of large subs isn't going to really pressurize this space as happens in a small room either, but it's bound to be an improvement. I'm pretty confident that quality stereo subs carefully setup and crossed high enough to fill in even the 40-80 Hz area is worth a good try.