GBB i agree that using wall power only does not give all that these super fine amps can deliver. I ve used a dedicated line, BPT 2, Brick Wall, and now i m using a PurePower 2000 regenerator and this is hands down a step up compared to the others. I ve used Lessloss, PS Audio, stock, and now its Black Sand Violets for PCs.
I dont have any problems turning off my tubed Pre Amp with my Ref 9s on. If you mention it there must be others that do. Have a good one.