In browsing, this question occurred to me. The 2001RB is effectively two 1001RB power sections. The 1001RB was modified, aquiring significantly more power in the process. Why not replace the power sections in the 2001RB respectively? 1400 Watts vs. 1080 Watts. Not a huge difference, but I've yet to hear a complaint about too much headroom. Just a thought... (It has also occurred to me that this would be a great way to deal with the surplus of the original 1001RB power sections. Also, the 2001RB is stable to 2-ohms on each side. Perhaps there's more to the magic than two 1001RB power sections, though I suspect something similar could be done with the new parts.) Edit: Added quotes to upgrade in the thread subject.