I love the v-shaped signature of the DT990 but I want more height out of the soundstage. A few weeks ago I was able to listen to the AKG K612 with an Aune T1 with the E88CC Golden Lion tube. The soundstage was great and I could actually hear sounds coming from below ear level, basically from the floor. However, the K612 is a little too analytical for my day to day listening. I plugged my 990s into the same setup and the tube amp definitely helped, but I think I found the 990s limit with regards to soundstage. Any suggestions?