Headphones

I’ve never had the 6xx or 650, but have used the 600 for at least 10 years mostly for music production. I think the consensus is the hd600 are more “honest”. The 650 adds some bass but aren’t as accurate / correct etc. The 600 might be a little bass light but are a legit reference point.

That’s my understanding at least. I get pretty good results with making music that “translates” with the 600. That’s mostly from spending a ton of time with them, but says something about their correct-ness.

I would be curious to try the 660s2, but am not going to bother any time soon.