Esoteric F-05. Purchased it after realizing that a Rega Elicit R I purchased, while an excellent product simply didn't have the muscle to drive my ATC 19 v2' properly. While on paper the amplifiers have sort of similar power ratings the Esoteric takes the ATC' from a whisper to utterly explosive levels with a clarity that' just on another level from my Rega. Very Happy with it.
