A-400X
| Manufacturer | Pioneer |
| Function | Amplifier, Integrated (Stereo) |
| Produced | 1995 |
| Country | Japan |
| Form Factor | Standard Width |
| Signal Path | Analog Hardware |
| Dimensions | 42 × 12.6 × 35.2 cm (W × H × D) |
| Weight | 7.9kg |
| Frequency Response | 1Hz to 300kHz |
| Power output | 50 watts per channel into 8Ω (stereo) |
| Total harmonic distortion | 0.02% |
| Input sensitivity | 0.24mV (MC), 2.8mV (MM), 200mV (line) |
| Signal to noise ratio | 67dB (MC), 86dB (MM), 110dB (line) |