ST550
| Brand | Ultralinear |
| Manufacturer | Ultralinear Loudspeakers, Solar Audio Products, Inc. |
| Series | Synchronic Time Array |
| Function | Speaker |
| Produced | 1977-19?? |
| Country | United States |
| Model ID | ST-550 |
| Form Factor | Bookshelf / Stand Mounted |
| Signal Path | Passive Hardware |
| Dimensions | 45.1 × 87 × 43.2 cm (W × H × D) |
| Frequency Response | 27Hz-22kHz |
| Treble | 1" Dome |
| Midrange | 2" Dome |
| Bass | 12" Cone |
| Impedance (Nominal) | 8Ω |
| Crossover Frequencies | 700Hz, 4.3kHz |
| Recommended Amplifier Power | 20-100W |
| Power Handling | 100W |
| Enclosure Type | Sealed or Bass Reflex (User Adjustable) |
| Finish | Walnut Melamine (Optional: Oak, Walnut) |
| MSRP (1977) | $390 |
| Controls |
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