The Neumann KM 183 and KM 184 microphones are the successors of the well proven KM 83 and KM 84, which have been used since the seventies worldwide with great success. The KM 185 rounds out the series with a hypercardioid microphone.
The KM 183 is a pressure transducer with a boost of approximately 7 dB at 10 kHz in the free field. In the diffuse sound field it has a flat frequency response. The pressure gradient transducers KM 184 and KM 185 feature very smooth frequency responses not only for the 0° axis, but also for lateral (off-axis) sound incidence. In typical usage, there is no coloration of sound over a wide pickup angle.
Although the KM 184 has the same capsule as the KM 84, the microphone differs slightly on the 0° frequency response: The KM 184 has a gentle rise at about 9 kHz, a characteristic that was introduced very successfully with the KM 140. The result is a tonal balance that is fresher and livelier when compared to the KM 84 with its flat frequency response in that band.
This difference was achieved with just a slight change of the capsule’s rear opening, and is not due to resonances.
Key features
- Pressure/Pressure gradient transducer
- 20Hz to 20kHz frequency range
- Rated Impedance 50 ohms
- Rated load impedance 1 kohms
- Equivalent noise level, CCIR1) 22dB
- Equivalent noise level, A-weighted1)13dB-A
- Signal-to-noise ratio, CCIR1) (rel. 94 dB SPL) 72dB
- Maximum SPL for THD 0.5%2) 138dB
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