Hey, long time lurker, first time poster. I am looking for some suggestions to power my DT770 250ohm cans. Current listening is mostly done at Macbook Pro at work, PC Desktop at home and on my iPhone 6. I am hoping *knock on wood* to find a good catch-all solution for all three. I don't commute on public transport, so ultra portable isn't required. I would like to stick around $200. I've tried my buddys Fulla Schiit, and thought it was good, but was hoping for something to be able to drive the cans a little more. I have a number of old school receivers/amps including a Kenwood KA-6100, Kenwood KA-5700, a Harman Kardon 330B, and a Rotel RA-840BX4 that I could use. Let me know if anyone has any experience in a similar situation.