The best portable DAC we’ve tested has been given a follow up, and it could easily steal the crown from its predecessor if it lives up to its specs.  The Chord Mojo 2 picks up where the original Chord Mojo left off, and comes with what the company calls a “world-first technology”. Its lossless DSP (digital signal processor) apparently allows you to adjust the tone of the DAC to suit any pair of headphones without any degradation in audio quality.
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