ADS L810s get my vote. When I first heard them in about 1974, they blew my mind with their incredible clarity and definition. I finally bought a pair in 1979, and I absolutely loved them until my son blew them up listening to Magical Mystery Tour at ear-shattering volume (yes, I'm a proud dad!). Those speakers were simple, beautiful, and, when I eventually coupled them with a subwoofer, the system outperformed many "full range" speakers costing many thousands of dollars.
Great thread!
Great thread!