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| Test | D2 - Fiio (Vol. 50) | D2 - Headsix (Vol. 50) | D2 - PA2V2 (Vol. 50) | D2 - Unamped (Vol. 50) |
| Frequency response (from 40 Hz to 15 kHz), dB: | +2.19, -1.20 | +0.08, -0.59 | +0.05, -0.30 | +0.04, -0.28 |
| Noise level, dB (A): | -90.2 | -85.5 | -86.4 | -92.8 |
| Dynamic range, dB (A): | 91.1 | 85.5 | 86.4 | 92.8 |
| THD, %: | 0.027 | 0.0053 | 0.0050 | 0.0050 |
| IMD + Noise, %: | 0.084 | 0.015 | 0.019 | 0.0080 |
| Stereo crosstalk, dB: | -86.8 | -84.2 | -83.7 | -92.8 |
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