| Test | Aune X1 MK2 Toslink 16/44 | Aune X1 MK2 Toslink 16/48 | Aune X1 MK2 Toslink 24/44 | Aune X1 MK2 Toslink 24/48 | Aune X1 MK2 Toslink 24/96 |
| Frequency response (from 40 Hz to 15 kHz), dB: | +0.01, -0.07 | +0.01, -0.07 | +0.01, -0.07 | +0.01, -0.07 | +0.01, -0.07 |
| Noise level, dB (A): | -93.6 | -93.9 | -96.8 | -96.8 | -96.8 |
| Dynamic range, dB (A): | 93.7 | 93.9 | 96.8 | 96.8 | 96.8 |
| THD, %: | 0.0022 | 0.0023 | 0.0022 | 0.0023 | 0.0031 |
| IMD + Noise, %: | 0.0061 | 0.0060 | 0.0045 | 0.0045 | 0.0049 |
| Stereo crosstalk, dB: | -85.5 | -85.6 | -86.0 | -85.9 | -86.0 |