| Test | FiiO E5 (Normal) | FiiO E5 (Bass Boost) | FiiO E3 (Bass Boost) |
| Frequency response (from 40 Hz to 15 kHz), dB: | +0.03, -0.33 | +2.51, -1.30 | +2.22, -1.13 |
| Noise level, dB (A): | -94.8 | -94.1 | -70.6 |
| Dynamic range, dB (A): | 94.8 | 94.1 | 70.5 |
| THD, %: | 0.0082 | 0.0075 | 0.140 |
| IMD + Noise, %: | 0.051 | 0.059 | 0.261 |
| Stereo crosstalk, dB: | -70.2 | -73.0 | -67.6 |
