I got this little portable Topping NX4 DAC/headphone amp (192kHz / 32bit) yesterday and am extremely impressed. It only has USB in, but my plan is to mostly use it at my computer with headphones anyway. The headphone section sounds great and the line out (fixed) worked very well as a stand-alone DAC in my stereo system last night. It's only about the size of a deck of playing cards, though not as thick. It comes with a bunch of cable adaptors for different sources and is available in silver from other vendors, too.
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