The best speaker you ever heard?

I personally have loved most any speaker using a carbon fiber variant for the Tweeter and a fiber Mid range. Just very natural and open as heck. FAST is a word that comes to mind. I have heard ceramics sound great too, but not like carbon drivers when utilized properly.

Quadral Speakers, I have the Platinum M50 as Main Speakers and are awesome. Better than many big brand and costly speakers.

I've aquired a pair of Casta Acoustic model C's. Best I've owned and heard. Can't go wrong with a 2" horn, 17" horn midrange, 15" bass driver in each. Dynamic, robust, coherent as hell and lazed sharp imaging. Delicate when needed though deep and authoritative. The amount of information I get out of these made me rid my centre channel, Svs Pb13 ultra subwoofer and maybe soon my rear speakers.

Jump on Radio Shack before they are gone!!!

Steen Dossing designed SD! loudspeakers.Brilliantly transparent and punchy too. Slightly woolly bass but great to listen to through some top level Audio research gear. The only fault with them was they had a ribbon tweeter that would blow if you put too much juice through them.