661B
| Brand | Altec Lansing, Altec |
| Manufacturer | Altec Lansing Corporation |
| Function | Microphone |
| Produced | 1958 |
| Country | United States |
| Form Factor | Stand Mounted |
| Signal Path | Passive Hardware |
| Dimensions | 4.1 × 4.1 × 13.5 cm (W × H × D); 9.5 × 8.9 × 14.2 cm (W × H × D) |
| Weight | Mic: 0.6lbs, Stand: 3lbs |
| Frequency Response | 30Hz-15kHz |
| Element Type | Dynamic |
| Output Impedance | 30/50Ω, 150/250Ω, 20kΩ (Selectable) |
| Output Level | -55dBm/10dynes/cm² |
| Finish | Dark Green |
| MSRP (1958) | $59.40 |
| Notes | Shown with optional Altec 258 Desk Stand ($15) |