I recently bought the 650's (6XX) and sold them the next day. I liked the relaxed treble but damn, the bass was way over the top. I just bought a used pair of 600's so I'll see how that goes. (Haven't heard them yet).Of all the comments I've read about the 600's I have never seen anyone complain about them being too bright. Most of the comments say they are the opposite of bright and that the 800's are a lot brighter. In fact, a friend of mine ditched his 600's because he said they were too veiled.I just noticed this review about someone complaining about the treble...