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The Neumann AK 20 microphone capsule is part of the KM 100 miniature series microphone systems. The AK 20 features a pressure gradient, single diaphragm transducer with a figure 8 polar pattern. The diaphragm diameter is just 16mm and all sound field components reach the diaphragm directly.
The end result is even frequency response and output levels from 0 to 180 degrees in proximity. The figure 8 polar pattern is effective in stereo MS recording (with an AK 40 or other cardioid mic), ambiance capturing or lectures and conferences with 2 speakers at either ends of the microphone.
| Transducer | Pressure Gradient Condenser |
| Polar Pattern | Bi-Directional (Figure-8) |
| Frequency Response | 20 Hz - 20 kHz |
| Dynamic Range (Typical) | 122.5 dB |
| Signal-to-Noise Ratio | 68 dB, Related at 1 Pa at 1 kHz (CCIR dB) 76.5 dB, Related at 1 Pa at 1 kHz (A-Weighted dB) |
| Maximum Input Sound Level | 140 dB, Less than 0.5% THD (without Preattenuation) 150 dB, Less than 0.5% THD (with Preattenuation) |
| Power Requirements | Phantom +48v (KM 100 Power Supplies) |
| Output Impedance | 50 Ohms |
| Output Connectors | XLR-3M Type (KM 100 Power Supplies) |
| Pad | Yes, -10 dB Preattenuation |
| Low Frequency Roll-Off | Use KM 100F |
| Dimensions | 4.4 x 0.88" (110 x 22mm) (Length x Diameter) |
| Weight | 3.6 oz. (102 g) |
| Package Weight | 0.3 lb |
| Box Dimensions (LxWxH) | 5 x 3.5 x 2" |
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