PS 9
| Brand | ESS |
| Series | Performance Series |
| Function | Speaker |
| Country | United States |
| Model ID | Performance Series Model 9 |
| Form Factor | Bookshelf / Stand Mounted |
| Signal Path | Passive Hardware |
| Dimensions | 26 × 45.7 × 26 cm (W × H × D) |
| Frequency Response | 60Hz-20kHz ±3dB |
| Treble | Heil Air-Motion Transformer (Rotatable, Radiating Area: 10.4in², Transformation Ratio: 5.3:1) |
| Bass | 8" Paper Cone |
| Sensitivity | 94dB/W/m (80dB/W/4m) |
| Impedance | 6Ω |
| Crossover Frequency | 2.4khz |
| Dispersion (Horizontal) | 120° |
| Dispersion (Vertical) | 40° |
| Power Capacity | 70W |
| Enclosure Type | Bass Reflex |
| Finish | Walnut-grained Vinyl |
| Connections |
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