Open back Vs Closed back. Basically in my case dt 770 pro vs dt 990 pro. I know what open back are for, wide soundstage, immersive sound bla bla bla. I know what they are for and what closed back are for. Dont comment " If you want flexibility and for travel go for 770 pro..." I just want to listen music in a quite room of mine. The question is, is the extra buck worth for the DT 990 PRO??