That's them; Quad ERA-1. they're great for serious music listening. Something like Led Zeppelin's Presence, on which you can pick out all the layers on Jimmy Page's overdubs. The album sounds very different then to playing it through the loudspeakers, up against the furniture and room dynamics. The obvious example is Pink Floyd's Dark Side Of The Moon, which Gilmour says has 7 guitar overdubs on, but I can't count that high anyway!
The Elegia's are just for fun, toe-tapping rock tracks, where I don't have to do any thinking. Just crank it up and get lost in the music.