The best speaker you ever heard?

Bose? Come on- the concept is absurd. The results are poor.

Considering the fact that you keep introducing the same product to this thread over and over again, you set off the shrill shill alarm. Even if Bose made a credible product, your incessant push would serve to discredit them just as it has already discredited you. The 901 is not even a good speaker much less a candidate for "best" anything. Give it up.

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Disclaimer: I don't go to audio shows and I don't know any audiophiles that I can visit to listen to other systems. I don't go to brick and mortar stores because of the pressure and attitudes of the sales people. So, the best speakers that I have ever heard are my own, Infinity IRS Beta.
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The best I have 'ever heard' would have been different auditions at different times in my life; each leaving an indelible impression in my auditory memory. I haven't 'owned' any of these however but would love to enjoy them someday.

KEF 107/2 Raymond Cooke Special Edition
Duntech Sovereigns
Magnepan 20.1s
Dynaudio Confidence C4s

and one I currently own which still produce (on axis) the best midrange ever. Martin Logan CLS (first version).

Macrojack, back when they sold these BOSE 901's in High End stores people use to RAVE about them ! It was Only after they started selling the 901's in Discount Stores did people start bashing the 901's !!...

Ammending a previous post--which I've started to do many times, but just didn't bother...the very best speaker system I've heard, by a really wide margin is the MBL System.
I'm extrapolating what I heard, from the big po (potential) that was there, based on the handicap of the venue.
Show venues, and I know this from exhibiting personally, as far back as 1986--are a nightmare...poluted electrical lines, inadequate power, flimsy room construction, terrible diminsions...you name it, they're all there to some degree.

In Munich a couple of years ago, I heard the MBL's always a curiosity of mine, based on the 'look and feel' of the product.
So, while exhibiting myself, in my own suite, I took a bit of a break and visited their room.
The MBL's do things dynamically that most speakers have real issues with--and let's face it, one missing ingredient of loudspeaker reproduction is 'Dynamic Fidelity', (thanks Jim Thiel). Without the enormous contrasts which ARE one prime ingredient in accurate reproduction, we have a truly renditional moment, instead of a passable faxcimile. (sp?)
Then, there's scale...which is to say, size of, focus of, and the three diminsions necessary to complete the whole of the experience.
The MBL's handle these areas with aplomb and are, therefore, IMHO, easily the best of those that I've experienced.
Do they cost a lot? Yes--but then, you get a lot--a whole lot!

Best,
Larry