| Test | Cowon S9 (2.07, vol 40, 16 Ohm) | Cowon O2 (1.14b, vol 50, 16 Ohm) | Cowon D2 (2.57, vol 50, 16 Ohm) | Cowon X5L (1.10, vol 40, 16 Ohm) |
| Frequency response (from 40 Hz to 15 kHz), dB: | +0.21, -1.45 | +0.13, -1.79 | +0.30, -3.56 | +0.37, -3.17 |
| Noise level, dB (A): | -91.6 | -93.5 | -92.0 | -91.6 |
| Dynamic range, dB (A): | 91.5 | 93.5 | 91.8 | 91.6 |
| THD, %: | 0.046 | 2.977 | 0.084 | 1.147 |
| IMD + Noise, %: | 0.037 | 2.255 | 0.054 | 0.245 |
| Stereo crosstalk, dB: | -41.9 | -57.1 | -42.8 | -37.9 |
