Originally Posted by matthewpl
After some time with both I would choose K550 connected with not-as-good source than K712 with good source. The thing is about bass. With the same source, K550 has wider and smooth and softer bass than K712. I think it is also louder. But opposite to K712 is better balanced with mids and treble. K712 has more punch but lacks low end bass compared to K550. Bass in K712 feels also more raw.
K712 has much better mids and treble. But when bass is starting it doesn't really matter because it destroy everything else. But I am not bass head and this is my very personal opinion. A little bit less bass, a little bit more mids and treble, a little bit less details and more musical and K712 would be perfect headphones to enjoy the music (at least rock music).
EDIT: I forgot about this but K712 feels more sealed than K550, which itself is weird because K712 are open and K550 are closed headphones.
Based on your comments it sounds like you would like the Q701 (warmer version of the regular K702). If you can, try some K702/Q701 pads on the K712! The bass is usually just caused by the pads.
I've found the Q701 to have more upper mids and treble than the Anniversary (and perhaps K712 if it's the same). Sounds clearer too. The Annie does seem to have more mid-bass and low mid presence.
I still think the low bass of the Annie/Q701 is pretty pathetic compared to even the HD-650.
BTW I ALSO noticed the memory foam pads seem to give the headphone more isolation sort of. There is also more volume at the same volume settings with memory foam pads compared to regular pads.
For rock I think the K601 might be better than the Q701. Not really sure..
I didn't like the K550 because mine had rather thing thin/lean mids, but good bass. The K551 does seem to measure differently or better on the Goldenears website. Could be variations between pairs.
I want to find another closed headphone under $200 that has the bass of my DJ100/HD-650, but still retains good mids and isn't too dark. I was thinking of the HFI-580 (might have to sacrifice my mids a bit). The low bass of the DT-770 Pro 80 is a bit much..