Is there an issue with having built-in subs versus having speakers without the built in subs if the performance is similar?
I don't think there's an issue necessarily, BUT, separate subs allow you to strategically place them to take advantage of different rooms while not having an effect on the ability to optimize the imaging abilities of the main speakers. Multiple subs, as in the four in his Swarm Bass System, tends to blend better and be a smoother integration - that according to Duke and to my own ears. I didn't read the thread; are those active or passive subs that those speakers have in them?

