| Model ID | IRS Sigma |
| Form Factor | Floorstanding |
| Signal Path | Analog Hardware |
| Dimensions | 47 × 148 × 41.3 cm (W × H × D) |
| Weight | 195lbs |
| Frequency Response | 30Hz-42kHz ±2dB |
| Tweeter (Front) | EMIT-B Neodymium* (PN 902-5228) |
| Tweeter (Rear) | EMIT-B Neodymium (PN 902-5228) |
| Midrange | Neodymium EMIM** (PN 902-5339A) |
| Midbass | 6.5" IMG Cone (PN 902-7379) |
| Woofer | 12" IMG Infinity/Watkins Dual Voice Coil Woofer (PN 902-7502) |
| Sensitivity | 87dB/W/m |
| Impedance | 4Ω |
| Crossover Points | 160Hz, 600Hz, 3.8kHz |
| Power Handling | 500W |
| MSRP (1996) | $10,000 |
| Connections | - Input · Binding Post (Universal)
|
| Controls | - EMIT Level · Toggle Switch · 3
- EMIM Level · Toggle Switch · 2
|
| Notes | *EMIT (ElectroMagnetic Induction Tweeter)
**EMIM (ElectroMagnetic Induction Midrange) |
