PS 4
| Brand | ESS |
| Series | Performance Series |
| Function | Speaker |
| Country | United States |
| Form Factor | Floorstanding |
| Signal Path | Passive Hardware |
| Dimensions | 31.8 × 88.9 × 30.8 cm (W × H × D) |
| Weight | 48lbs |
| Frequency Response | 35Hz-24kHz ±3dB |
| Treble | Heil Air-Motion Transformer (AMT) (Total Radiating Area: 10.4in², Transformation Ratio: 5.3:1) |
| Midrange/Bass | 10" Cone |
| Passive Radiator | 10" |
| Sensitivity | 96dB/W/m (81dB/W/15') |
| Impedance (Nominal) | 6Ω |
| Crossover Frequency | 2.4kHz |
| Dispersion (Horizontal) | 120° |
| Dispersion (Vertical) | 40° |
| Power Handling | 160W |
| Enclosure Type | Passive Radiator |
| Finish | Walnut-grain Vinyl |