| Model ID | IRS Delta |
| Form Factor | Floorstanding |
| Signal Path | Analog Hardware |
| Frequency Response | 28Hz-45kHz ±2 dB |
| Supertweeter | SEMIT-k (PN 902-3465) |
| Tweeter (Front) | EMIT-k* (PN 902-3721) |
| Tweeter (Rear) | EMIT-k* (PN 902-3721) |
| Midrange | EMIM** Rev. C (PN 902-0012C) |
| Midbass | L-EMIM (PN 902-3431) |
| Woofer | 12" IMG Cone (x2) (PN 902-3054) |
| Sensitivity | 87dB/W/m |
| Impedance | 4Ω |
| Crossover Points | 100Hz, 750Hz, 4.5kHz, 10kHz |
| Horizontal Dispersion | ±2dB in 180° |
| Finish | Santos Pau Ferro |
| Connections | - Input · Binding Post (Universal)
- Servo-Control Cable · DIN
|
| Controls | - Super Tweeter Level · Rotary Pot
- Tweeter Level · Rotary Pot
- Upper Midrange Level · Rotary Pot
- Midbass Coupler Level · Rotary Pot
- Servo · Toggle Switch
- Bass Extension · Toggle Switch
|
| Notes | *EMIT (ElectroMagnetic Induction Tweeter)
**EMIM (ElectroMagnetic Induction Midrange)
Identical to the IRS Gamma except the servo control was not included. The Delta could be upgraded to the Gamma with the optional purchase of the electronic control unit and the speakers were so marked "Delta/Gamma" to that purpose. |
