Fwiw I've got a DDA running in a second system. It's driving a pair of Harbeth P3esr's. It does a decent job on them and is competitive with a Musical Fidelity M3 integrated I used to have. On kef ls50's the DDA didn't handle them as well as the mufi. Overall it's a nice enough little amp for its price. Haven't heard the NAD though so I can't make that comparison. Sorry I can't tell you more, hopefully others will chime in.
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