It was a really nice pair of original Quad 57's that came with a pair of Futterman H3aa's that I picked up in the mid-eighties that I'll count as one. It was always a love/hate relationship; I always wanted more output out of them and I'd go back to a box speaker but would always go back to the Quads. To me, within their range, they are amazing in that this fifties technology gets you 90%-95% of what is available today. With a modern preamp and source, they shine. I remember listening to them at the local dealer I purchased them from with a Spectral DMC 10 preamp and a fully loaded LP12 back then and it was stunning, even when compared to Modern ESL 63,s and a pair of Entec SW-2's. I still own the Quads but they reside in my basement with one of them out of commission. The Futterman's I got rid of long ago as they were problematic.
Either that or my LP12 which has been with me in constant use since 1986 that drove my view of analog superiority.
Or my Esoteric K-OX3D / F-05. The K-OX3D changed my worldview on digital music but with the F-O5 sometimes startles the sh@t out of me.