The headphones arrived from Audio46 in NYC with included next day shipping. So, please take that as additional context. Now, whether or not you think break-in is real, of course, these impressions are of brand new headphones. Music sources: A ton of *very* well recorded / boutique level vinyl, Tidal streaming Headphones I have owned: many more, including Sony R10 (bass light)
Headphones I own: Abyss Phi CC, Audio Technica ATH-W2002, Grado RS-1, Stax SR-009
Been listening to the ATH-L5000 for a few hours! Here's my setup: