Which version of the 770s? How did your T90 change?
32 ohm LE.
The T90s...hard to say precisely, because I also added a small piece of tissue beneath the foam driver cover before swapping pads. That definitely tamed the treble a bit even with stock pads, but the most noticeably change from that to the leathers was the sense of extension and tight impact to the bass, and a little bit further reduction in treble, probably due to the mesh cover.