Originally Posted by grizzlybeast
maybe because in sheer quantity it is louder.
Here is what makes the hd650 soo amazing. The drums and instruments punch through the mix and dont sound diffuse or non engaging when it is properly driven. This may explain the bass of the k712 being louder but less felt. Overall the hd650 is great with dynamics. A lot of orthos lack this imo and the k712 sounds like an ortho in that regards to me though not as much.
I personally found the HD650 to be pretty stale and lifeless. I was doing direct comparisons with the Q701, Fidelio X1, Hifiman HE-400, and Senn HD598. The Q701 was fantastic to me, but I found myself swapping with the X1's often, because while I loved the Q701's spacious sound, it was just lacking. The K712 fills that gap so nicely. I found that I wasn't missing anything that the X1 offered, and whenever I'd swap with the X1, I found the bass that I loved so much from the X1 to be too unnatural, or overpowering.
K712 vs HD650, matter of preference I'm sure, but the K712 is the clear winner for me.