There are 4 occasions I distinctly remember, when I thought F me sideways.
1. My 1st BO when baggawire put his AuroraSound Vida into my system inplace of my Icon Audio PS1. 2SE, which sent me off down the phonostage rabbit hole, via a PS3SE an MFA SUT & 2 Trons before ending at the BB3.
2. Upgrading to an OL Conqueror 3C from an Enterprise 3C, all of a sudden there was space between instruments and everything was so much easier to follow.
3. Upgrading from my very very competent MasterSound phl5 to an MFA Baby Reference V1 pre, there was just more of everything.
4. The acquisition and dialling in of my ML Summits, they really have been the icing on the cake, giving deep, tight, nuanced bass with superb detailed mids and highs. 6 months on from their purchase I still experience jaw dropping moments.