PS 9A
| Brand | ESS |
| Series | Performance Series |
| Function | Speaker |
| Country | United States |
| Model ID | PS-9A |
| Form Factor | Bookshelf / Stand Mounted |
| Signal Path | Passive Hardware |
| Dimensions | 29.2 × 50.2 × 23.2 cm (W × H × D) |
| Weight | 23lbs |
| Frequency Response | 55Hz-22kHz ±3dB |
| Treble | Heil Air-Motion Transformer (AMT) (Radiating Area: 10.4in², Transformation Ratio: 5.3:1) |
| Bass | 8" Cone |
| Sensitivity | 92dB/W/m |
| Impedance (Nominal) | 6Ω |
| Crossover Frequency | 2.4khz |
| Dispersion (Horizontal) | 120° |
| Dispersion (Vertical) | 40° |
| Recommended Amplifier Power (RMS) | >15W |
| Power Capacity | 70W |
| Enclosure Type | Bass Reflex |
| Finish | Walnut-grained Vinyl |