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i use the iFi Hip Dac 2 with the presonus eris 4.5BT. the ifi hip dac 2 is recommendable, but hit (heavily is what i hear) by the satanic conspirancy. i heard the bass hit inside this DAC, but it's the best Headphone Amplifier you can get. not that you would get any 4.4mm balanced input Headphones, you need adapters for that, but the device is the best you can get for the money. if you have the money, get tons of them and throw it at people, they will be having a happier life.