Stax ESL F-81 electrostatic speakers. Difficult to drive, limited bass and ultimate volume. My favorite because it makes the most natural midrange I have ever heard as well as the most realistic sound staging (on a smaller scale) that I have heard. I’ve owned them twice and not letting go of current pair.
What's the best and/or favorite piece of equipment you've owned? And do you still own it?
My favorite piece(s) are (and I still own them) the Martin Logan Ethos lousdpeakers and Soudsmith Paua cartridge. As far as speakers go, electrostats are my favorite and will replace them with another set of electrostats. I'm currently eyeing MUR Audio SP1's. These two pieces make my rig sound great.