| Model ID | Four |
| Form Factor | Bookshelf / Stand Mounted |
| Signal Path | Passive Hardware |
| Dimensions | 37.1 × 58.4 × 31.1 cm (W × H × D) |
| Weight | 30lbs (Net), 36lbs (Shipped) |
| Frequency Response | 60Hz-20kHz ±2.5dB |
| Treble | Constant Directivity Horn Loaded Piezo (Altec Mantaray, Altec LZT (Lead-Zirconate-Titanate)) |
| Midrange/Bass | 10" Paper Cone |
| Sensitivity | 88dB/W/m |
| Impedance (Nominal) | 8Ω |
| Crossover Frequency | 2kHz |
| Dynamic Range | 45dB |
| Dispersion (Horizontal) | 100° |
| Dispersion (Vertical, Up) | 40° |
| Dispersion (Vertical, Down) | 20° |
| Maximum Output | 105dB |
| Recommended Amplifier Power | 20-200W |
| Enclosure Type | Bass Reflex |
| Finish | Endriana |
| MSRP (1981) | $249.95 |
