I found the R9 to be very thick and bassy.
The SR2’s are a lot more open sounding to me. Great bass and forward mids. They feel much flimsier due to the headband design. Overall I find the sound much cleaner and more articulate. I found the treble a little recessed, but that works for me.
When I need the Boom, I use my Cascades. The R9’s, in the end, just lacked clarity for me.
I made a post over on reddit r/headphones about pad swapping the HE-R9s with those oversize foam pads people buy for KPH30is or that are sold as meant for Grados - thought I’d put it in here for the HE-R9 owners thread.
I’ll keep it short here but unbelieveable transformation of sound, and listening now in the cold light of the next day, they still sound really good. I was thinking maybe i got carried away when I first tried it but coming back to them today I’m still impressed. With a little bit more tuning (with people who know what they’re doing!) these could be great.
I’d love for anyone who owns these to give it a shot, at the very least to see if I’m not crazy.