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Auditioned these and the Massdrop x Hifiman 4XX's via USB from laptop to Massdrop O2/ODAC. Upgrading from ~5yo Sennheiser 595s. I preferred the 6XX over the 4XX: more bass, more detail, better fit, more comfortable with glasses. The sound is a moderate improvement over the 595s, as you'd expect. Sound is similar from the headphone out on my Marantz AV8802A; IIUC, both that unit and the O2/ODAC use AKM 4490 DACs, so you'd expect it to sound similar. Recommend them over the 4XX's (mine are for sale!), but also note that companies like Massdrop are making it pretty hard to hide in headphone land: better headphones cost more, and not-quite-as-good ones cost not-quite-as-much.