Carolina Pitbull
100+ Head-Fier
I only have experience with the HD 6XX's. I think they sound great listening to everything from Iron Maiden, Opeth, Cannibal Corpse, John5, BabyMetal, Sabaton... well, you get the picture. In order of preference I have used them with the following:
1. Lyr 3 - Modi Multibit
2. Magni 3 - Modi Multibit
3. DragonFly Red
4. FiiO X3 - 2nd Gen
5. Iphone 6
I have also used both the DragonFly Red and FiiO as a DAC with the Magni and Lyr which also produced great results.
1. Lyr 3 - Modi Multibit
2. Magni 3 - Modi Multibit
3. DragonFly Red
4. FiiO X3 - 2nd Gen
5. Iphone 6
I have also used both the DragonFly Red and FiiO as a DAC with the Magni and Lyr which also produced great results.