Chorus Δ
| Brand | Opus 3 |
| Manufacturer | Audio-Produkter A/B |
| Designer | Bo Hansson |
| Function | Speaker |
| Produced | 1988 |
| Country | Sweden |
| Model ID | Chorus Delta |
| Form Factor | Floorstanding |
| Signal Path | Passive Hardware |
| Dimensions | 28 × 78 × 32 cm (W × H × D) |
| Weight | 25kg |
| Frequency Response | 45Hz-20kHz ±3dB |
| Treble | 1" Soft Dome |
| Midrange/Bass | 6.5" Poly Cone |
| Sensitivity (96dB/1m) | 5W |
| Impedance (Nominal) | 4Ω |
| Crossover Frequency | 3kHz |
| Crossover Slope | 12dB/Oct (Second Order) |
| Power Handling | 40W |
| Power Handling (Music) | 60W |
| Enclosure Type | Bass Reflex |
| Enclosure Construction | Concrete |
| Enclosure Volume | 25l |
| MSRP (1988) | 2200 kr |