Originally Posted by David1961
After I was advised about the HD600's, I decided to order both the HD600 + 650 from the same place explaining I'd be sending one back. I listened to both headphones with my Pico Slim which I'm only using until I receive the new GS-X and preferred the 600's. I found the 650 had more bass, but the HD600 gave better detail so for me the 600 sounded a lot better than the HD650. So like Velocity mentioned, not sure why it's placed behind the HD650.
I've a 4 pin XLR custom cable on order for the 600's to use with the GS-X so I'll find out if there's much difference between that and the stock cable.
That's very nice of them to let you try out both.
I think people put the 650 above the 600 just because it's a higher model number, but from what I've heard, the HD598, 600, and 650 are almost the same, with a slight edge going to the 6X0 in terms of natualness and such, but that there is more of a difference in sound sig than sound quality per se.
Originally Posted by preproman
Some might prefer a little more bass. It can make a headphone more musical to some. The 600s might have better detail when the two are compared, but the 650s sure does not lack any detail.
The GS-X will bring out all the detail a headphone has. It will also dispose of it's true faults.
I really do think the 600 lacks subbass quite badly, but unfortunately the 650 does as well... But the bass is fairly balanced on the 600, while being slightly elevated on the 650.