Crescendo
| Brand | Opus 3 |
| Manufacturer | Audio-Produkter A/B |
| Designer | Bo Hansson |
| Function | Speaker |
| Produced | 1988 |
| Country | Sweden |
| Form Factor | Floorstanding |
| Signal Path | Passive Hardware |
| Dimensions | 23 × 104 × 40 cm (W × H × D) |
| Weight | 55kg |
| Frequency Response | 23Hz-20kHz ±3dB |
| Treble | 1" Metal Dome |
| Midrange/Bass | 8" Polypropylene Cone |
| Sensitivity (96dB/1m) | 3.2W |
| Impedance (Nominal) | 4Ω |
| Crossover Frequency | 2.5kHz |
| Crossover Slope | 12dB/Oct (Second Order) |
| Power Handling | 60W |
| Power Handling (Music) | 100W |
| Enclosure Type | Transmission Line (Length: 2.5m) |
| Enclosure Construction | Concrete |
| MSRP (1988) | 5000 kr |