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I'm new to the dac/amp world, so between the Topping NX4 or the XDuoo XD-05 which has a better value in the long run and which of the two the Topping NX4 or XDuoo XD-05 would better power a Sennheiser HD660s (going to purchase the Sennheiser HD660s within the end of the year)
NX4 powers my HD600's past comfortable listening levels. It has a much nicer/smaller form factor than the XDuoo IMO, but it doesn't have a display like this one. Since I've never A/B'd them, I can't say which gets louder, or sounds better to me.
I have both Amps. The HD660's are not really difficult to drive. Either Amp will be fine. But I recommend the Xduoo since it will allow you to use less efficient headphones like the HD650's of HE4XX's if you decide to upgrade to those type cans later.