I personally dont notice any difference between my note 4 and fiio e6 compared to creative zxr with headphone amp on my hd600, I think the whole amp thing for hd600/650 is massively overblown
Have to disagree - while I'm far far far from an expert I've spent a massive amount of time and no shortage of money (literally spent more than the price of a pair of Schiit Ragnaroks) experimenting with building many different solid state amp designs and seen a huge range of performance out of my HD-600s.
IKR I just think anything non usb powered with some decent slam
If it is well designed and designed to use 500+ma from a USB source then you can get a fair bit of power out of a USB(5V) powered amp.
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