The best speaker you ever heard?

Hansen Speakers .. all of them

...and that would be Carl Marchisoto's Alon line of speakers namely the Lotus SE series with their Alnico magnet drivers but the Alon 1's, when placed in the appropriate sized room, can blow away pretty much any competition given care is used with the ancillary equipment.

Cheers

The most perfectly satisfying speaker that I have ever listened to is ther Harbeth Monitor 40. Despite the many far more expensive systems that I have auditioned in the past, these were the first that were above criticism- they just play music.

I was impressed by the Harbeth Monitor 30 when I first heard it. But I wouldn't put it in the top tier of best speakers, as by definition to be able to realistically reproduce for example an orchestral piece, you need something bigger.

The best speaker system I ever heard I own: Evolution Acoustics MM3 but especially paired with Dartzeel's its a match made in heaven...

Hands down, it was a nifty little 3-way designed by Andrew Hefly (formerly of GAS). He designed the Granson of Ampzilla, and the Godzilla, among others. I've heard them all and nothing ever came close.