Simple words to summarize the experience... It sounds like a full size can with airiness like the 1plus2.
I only managed a brief session with the Ref. 1 and not doing any justice to its full potentials. However, it is for sure an upgrade to the already excellent 1plus2.
FYI ...I was using the AK240 direct.
Might just have to get a pair for myself to try (even though I already vowed to stick with just one IEM)