I have tried to sift through many threads about this portable amp, looking for specific info on the types of phones it will work well with. I'd like to replace my cmoy with a portable amp that does a better job with my DT770 250 ( 2005) and HD600. I like the idea of fooling around with the opamp rolling kit to fine tune. Bottom line...will I get very good sound driving the two sets of cans mentioned above with this portable amp? Thanks!