Sounds pleasant and "flat" in a sense that no sounds stick out to "bite" your ears. The way they sound makes them suitable for very long sessions, IMO. unless, their character backfires for you and you fall asleep or something mundane distracts you from the music - as they don't really "grab" you by their sound, or attract you to particular parts of music - I can imagine some people might find them unexciting or boring. The HD650 sounds more dynamic and less boring maybe, BUT their HD650 sub-bass is nonexistent, combined with emphasized bass/lower-mids results in weird sound IMO. These have some perceivable sub-bass, actually. I like the vocals on r70x more than hd650. Hooked up to a ~60Ohm output impedance amp these sound a little more fun and with more bass and emphasized vocals - but i prefer them with my sub-milliohm low distortion amp (maybe it's not the impedance, but the low quality(?) opamp circuit in my CDP-x303es). Pads wont cover some larger ears which will likely result in discomfort. I'm sorta lucky as my ears actually go a little under the pads - no problem with wearing them for multiple hours, even though I can feel the pads not exactly right on my ears. Stock cable is around 3Ohms (gnd+signal). Thomann sent me a used Taiwanese pair (bstock?) even though I ordered new. Refunded 20€ which I consider sub-optimal but whatever. at least they're not an abused pair.