LS 4
| Brand | Tempest, ESS |
| Series | Lab Series |
| Function | Speaker |
| Country | United States |
| Form Factor | Floorstanding |
| Signal Path | Passive Hardware |
| Dimensions | 31.8 × 88.9 × 31 cm (W × H × D) |
| Weight | 48lbs |
| Frequency Response | 35Hz-25kHz ±3dB |
| Treble | Heil Air-Motion Transformer (Total Radiating Area: 10.4in²) |
| Midrange/Bass | 10" Cone |
| Passive Radiator | 10" |
| Sensitivity | 96dB/W/m (82dB/W/15ft) |
| Impedance (Nominal) | 6Ω |
| Crossover Frequency | 2.4kHz |
| Dispersion (Horizontal) | 120° |
| Dispersion (Vertical) | 40° |
| Power Handling (Peaks) | 160W |
| Enclosure Type | Passive Radiator |
| Finish | Oak (Grill: Dark Brown) |