Sans Pareil Mark IV
| Brand | Fourier Components |
| Manufacturer | Fourier Components, Inc. |
| Designer | Tom Gambill, John Atwood |
| Function | Amplifier, Power |
| Produced | 199? |
| Country | United States |
| Model ID | Sans Pareil MkIV |
| Form Factor | Standard Width |
| Signal Path | Analog Hardware |
| Dimensions | 45.7 × 19.1 × 62.2 cm (W × H × D) |
| Weight | 70lbs |
| Power | 115VAC/230VAC, 50/60Hz 518W |
| Frequency Response | 5Hz-100kHz |
| Output Power (8/4Ω) | 190W/120W |
| Amplifier Type | OTL (Output Transformerless) |
| Output Tube | PL509 (x10) |
| Input Sensitivity | 1V |
| Input Impedance | 275kΩ |
| SNR | >85dB |
| Tube Complement | PL509 (x12), 6EJ7 (x3), 5651 (x2), 6922 (x2) |
| Channels | 1 Channel |