This thing makes my DT 990 Pro 250 ohm sounds completely different on corrective mode, it's like a whole new set of cans. I'm not sure if it's good or bad, I'm kind of confused by this thing and a bit shocked to be honest, because it "feels" right.

I've also tried matching the DT 990 to the SR60, and although it gets it in the ballpark it's not as shocking as the corrective mode.

Need to test more.