Hi,

Snap back to reality.

First, virtually all CD's are still mixed "mono compatible", meaning the stereo separation at low frequencies is really low. So, the bass is in essence STILL mono. So, you can make the bass still stereo, while keeping most of the advantages pointed out.

As for time alignment, a whole cycle of an 80Hz wave is > 4m Long. Depending on the room size this can indeed be an issue, HOWEVER, you can expand my idea by placing subs in suitable nodes. Finally, using a Behringer DCX2496 and 6 channels of amplification would alolow you to drive your subwoofer array time coherent, although this then again monkeys around with the room mode cancellation.

At any extent, there are many ways to audio. For anyone wishing to know what a really serious home HiFi system looks like, I recommend Dick Burwen's (he was/is Mark Levinsons mentor and responsible for quite a few of the ideas Mark has in his mind) very modest audio system.

Try to check that for time alignment at LF... ;-)

Without care ANY implementations results can be deeply dissapointing...

BUT (and here it comes), once you have added the delay, the room modes you had suppressed are BACK!

Hence (again) my point about directional speakers, they simply do not have the problems which we are here agonising to solve in ever which way. 

Ciao T