Mimouille
Headphoneus Supremus
Hifiman r2r2000
Hifiman r2r dap
I briefly auditioned both and feel they are very very different. Both are very transparent in a natural way, but the Hifiman sounds much more raw and aggressive whereas the Lp6 sound super smooth and analog. The one I have listened to was the gold one, so I am not sure whether the silver titanium one is different.