Compare Headphone Amp/DAC — Side-by-Side Specs

Headphone amp and DAC comparisons should lead with output impedance: the 1/8 rule says output impedance should be ≤ 1/8 of headphone impedance, otherwise the impedance curve colors the frequency response, especially on multi-balanced-armature IEMs. Measured THD+N, channel crosstalk, and dynamic range at rated power into your headphone's impedance are the meaningful specs. Balanced output (4.4 mm, XLR-4pin, 2.5 mm TRRS) doubles output power on paper; the audible benefit depends on the specific amplifier design.

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