I agree with above, nobody has heard all speaker manufactures.
When they first came out, I really thought BOSE made good speakers. I had auditioned them quite a few times years ago. Clearly they are overpriced.
I have not heard that many brands, and I have heard more car speakers and subs than any home speakers.
Car-Phoenix Gold, Orion, SoundStream, Kicker, Pioneer, Sony, JBL, etc(and more).. come to mind. (Kicker was best sounding, but not best built)
Home-Pioneer, Bic, Bic Acoustech, Klipsch Consumer and Reference, Sony, BOSE, B&W, Fluance, JBL, SDAT, Fisher Reference (studio speakers), etc(and more)...
I've heard a lot more, and even super expensive speakers. But usually when I see an outrageous price tag I just turn away. I have been to quite a few Audio Specialty shops, but anyhow..
Honestly for the super low price I paid for the system I have now, Acoustech's I am very happy with them. Considering they are compared to Klipsch Reference but at half the price (sound similar to me, and much better than the Synergy cheap series). However, I'm sure you can pay $7,500 for a single speaker. But truly is it worth it? I think not. Well, not unless you have serious amount of money and time to waste. IMO...
EDIT:: I had posted below supervij, but thought I would delete that and just add what I said onto this statement. So I would not be double posting on a contest thread.
I had posted:
Yeah I forgot about Athena and Yamaha. The Athena's I heard were ok. Yamaha's were overpriced IMO.
Anyway this is an add on statement, clearly I can't remember every speaker I heard...
Thats certainly why I put in "etc..."
OOPS also add Velodyne.
However I still say the Acoustech's are great, specially the H100 sub desinged by Dr. Hsu.
Its built like a brick, very sturdy... So clearly you could say I have even heard HSU, or at least something of very close design.