I bought what supposed to be Topping NX1s headphone amp but it comes as generic China headphone amp, but its dirt cheap so before I click for 'refund' I tested it, why not since I already got it.
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It doesn't sound too bad to be honest, at max volume its dead quiet, no hissing no popping, nothing weird. I quickly disassemble it to see what's inside.
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The windows really shows the innards, no trickery circuit. It doesn't look bad at all, apart from some shoddy soldering on gain and switch at the back. Its two discrete amp for each channel, for me discrete amp if build properly can sounds good, doesn't need an opamp which most of the time just color the sound. This one sounds natural to me. I decide to keep it but I leave a note to review it wasn't the item described for anyone really looking for Topping NX1s. It drives my Yuin PK1 and Senn HD595 well, that's what matter to me.