Really enjoyed going thru this thread yall, I see i posted in it back in 2012. Allow me to crown a winner, the Klipschorn, no other speaker can claim even a little of the longevity(sp) of the big K, this speaker has been in production since 1947 ? and basically unchanged since 1955. All these speakers came and went, the Klipschorn remains, and still 105db at 1 watt is a gold standard, too big you say, nah, once their in a corner you cant hardly see em. The thing is, and i've seen this a dozen times, these are so damm sensitive that the source is ultra important, perhaps more than any speaker. The thought that all you need is a good tube amp is a bit off, yes they love tubes, but the right SS amp can rival tubes, like a Yamaha B1 or B2, McIntosh has some great gear as well. I read an article by stereophile and he talked about how many amps he went through before settling on one, and it was not the one he thought it would be beforehand. Article was by Art Dudley in August of this year,,,,Roost