| Model ID | ST-525 |
| Form Factor | Bookshelf / Stand Mounted |
| Signal Path | Passive Hardware |
| Frequency Response | 30Hz-22kHz |
| Treble | 1" Dome |
| Midrange | 2" Dome |
| Bass | 10" Cone |
| Passive Radiator | 10" Cone (10" driver acting as passive radiator with voice coil shorted by variable resistor to adjust damping thereby adjusting tune) |
| Impedance (Nominal) | 8Ω |
| Crossover Frequencies | 700Hz, 4.3kHz |
| Recommended Amplifier Power | 20-75W |
| Enclosure Type | Passive Radiator |
| Finish | Walnut Melamine (Optional: Oak, Walnut) |
| MSRP (1977) | $350 (Optional Finishes: $390) |
| Controls | - Treble Level · Rotary Pot
- Midrange Level · Rotary Pot
- Bass Level · Rotary Pot
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