1605A NOALA
| Brand | Altec Lansing, Altec |
| Manufacturer | LTV Ling Altec, Inc. |
| Function | Accessory (Noise-Operated Automatic Level Adjustment) |
| Country | United States |
| Form Factor | 19" Rackmount |
| Dimensions | 48.3 × 8.9 × 19.1 cm (W × H × D) |
| Weight | 12lbs |
| Power | 120/240VAC, 60Hz or 24VDC |
| Loss | 26dB (Below Adjustable Threshold) |
| Automatic Level Adjustment Range | 26dB |
| Sensitivity Threshold | 60-70dB |
| Quench (Lock-Up) Threshold | -15dBm to 0dBm |
| Quench Release Time | 0.5s |
| Constant Background Hiss | 20dB |
| Source Impedance | 600Ω |
| Load Impedance | 600Ω |
| Sensing Line | 70V |
| Notes | Adjusts amplifier gain to compensate for fluctuations in ambient noise levels. |