This is kind of a post combining a reply to where has your system gone since 2011 and game changers. My system has evolved some since 2011, over time I have upgraded my ICs and speaker cables. This year I have added power cords from Waveform Fidelity. These changes markedly increased the resolution, focus and three dimensionality of the system.
A game changer this year for me has been adding subs to the system with digital delay. By operating them 180 degrees out of phase with the front speakers and delaying their output until the bass sound waves from front of the room are just about to hit the rear wall, I am partially canceling out the zones of standing waves in the room. This has made as big an improvement in the three dimensionality of the system as putting in a new preamp or power amp with intrinsically superior imaging and sound staging. Basically it uncorks your systems fundamental performance capabilities in this area. Better bass, of course, comes along for the ride.
I heard another game changer at this years CAF and that was the open baffle servo subwoofers in Rollo's room. This was some of the very best reproduction of bass I have ever heard. Particularly remarkable considering the size of the room involved. The other cool thing is that if your room is much larger and you are concerned about having adequate bass headroom, the system would easily scale up, without having a larger footprint in the room. It would just be enough taller to accommodate another woofer or two in addition to the three 12inchers already in the pair of subs.
Bass heads take note. One word describes this setup, BADASS!
Scotty