651AH
| Brand | Altec Lansing, Altec |
| Manufacturer | LTV Ling Altec, Inc. |
| Function | Microphone |
| Country | United States |
| Form Factor | Handheld / Stand Mounted |
| Signal Path | Passive Hardware |
| Dimensions | 4.4 × 4.4 × 18.4 cm (W × H × D) |
| Frequency Response | 60Hz-15kHz |
| Element Type | Moving-Coil Dynamic |
| Diaphragm | Mylar |
| Directivity Pattern | Cardioid |
| Discrimination (Front-to-Back) | 15dB |
| Output Impedance | 20kΩ |
| Output Level | -57dBm/10dynes/cm² |
| Hum (ref. 10⁻³ gauss) | -120dB |
| Finish | Satin Chrome |