Just got my ehp o2 and its made a massive difference to my Dragonfly V1.2. Separation is much improved, highs more sparkly with a very black background. Very impressed for the price.   Also works beautifully as a pre amp for my main set up.

Good dad skills!

It's a full size amp that drives my mission speakers. Yeah honestly 2000 ohms! Either way I'm after the crack/hd650 combo as soon as possible. Cheers

My integrated amp (arcam alpha 8) can drive headphones up to 2000 ohms according to the manual. Obviously hd6xx are 300 ohm but what's the deal, will they sound ok, be driven enough? I'm currently using. Dragonfly V1.2 and audio technica ad700 but Christmas is coming and hd650 are calling...