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Neumann SKM 140
Stereo Cardioid Microphone Set: 2x KM 140 Mics, 2x LC 3 KA 10m Mic Cables, 1x STH 100 Stereo Mic Mount, & Wood Box


Neumann's SKM 140 variable condenser miniature microphone system consists of an active microphone capsule, an output stage, and numerous accessories.
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Neumann SKM 140
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Neumann's SKM 140 variable condenser miniature microphone system consists of an active microphone capsule, an output stage, and numerous accessories.

Stereo Microphone Set Includes:

  • Two KM 140 cardioid microphones (AK 40 cardioid capsules, KM 100 output stages)
  • Two LC 3 KA 10 m microphone cables
  • One STH 100 stereo microphone mount
  • Wood box

Currently there are seven active capsules available: omni diffuse-field equalized, omni free-field equalized, cardioid, wide-angle cardioid, cardioid with bass roll-off, hypercardioid, and figure-8. (NOTE: Cardioid capsules are included, all others are sold separately.)

Through the modular construction of microphone capsules and the output stage, it is very easy to adapt the system to a wide range of applications.  The mic becomes nearly invisible during work with cameras (film, video), on stage, or suspended from the ceiling in a concert hall.

An active capsule can also be screwed directly onto the output stage.  The result is a compact miniature microphone.


The microphones are only 92 or 110 mm resp. long and 22 mm in diameter.  They consist of the condenser capsule and the output stage.  Both parts can be unscrewed from each other.  The system offers several condenser capsules with different directional characteristics.

Numerous accessories can be mounted between the capsules and the output stage.  The capsules attach to cables, capsule extensions, swivel mounts, table stands, goose-necks, stereo mounts, and hangers.  Therefore, it is very easy to adapt the system to a wide range of applications.

The active capsule itself is only 35 or 47 mm resp. long.  The KM 100 output stage and the active microphone capsule may be separated by up to 50 m of interconnecting cable.  These cables are 3 mm in diameter, and therefore very inconspicuous.

Acoustic Features

Neumann's AK 40 is a pressure gradient transducer with cardioid characteristic.  The frequency curves are very smooth and match 0° sound incidence.  Sound from sources within a pickup angle of ± 135° is reproduced without any coloration.

Electrical Features

The KM 100 is phantom powered (48 V) and uses transformerless output circuitry.  This has several advantages.  It features high output capability and extremely low self noise.  It provides exceptionally clean sound, free of any coloration.  As with traditional transformers, this circuit approach ensures good common mode rejection.  The balanced output signal is protected against interference.

The construction is extremely compact.  The entire microphone circuitry is on a single hybrid module measuring only 2 cm² in area.  It is built into the microphone capsule, therefore the term "active capsules".

All sensitive components are protected within the capsule.  As a result, the quality of the audio signal is never compromised through the use of accessories, for example, when the capsule is detached from the output stage and mounted on a cable or a gooseneck.

Even with a long cable between active capsule and output stage, the signal is immune to external interference.


The output stage has a 10 dB switch.  Attenuation is achieved by reducing the capsule voltage to one third.

When the switch is on, the microphone is capable of accepting sound pressure levels up to 150 dB without being overloaded.


To diminish the number of connectors within the KM 100 System some accessories were modified.  They can now be screwed directly onto the KM 100 output stage without using the KA 100 cable adapter.  The accessories, which include the cable adapter, were renamed adding the suffix KA.  For example: LC 3 is now LC 3 KA.

The separate KA 100 cable, needed for older accessories, will also be available in future.

The KM 100 output stage has a 3-pin XLR connector.

Stereo Recordings

By means of the AC 30 adapter cable two active capsules, AK 20 and e.g. AK 40 can be connected as MS stereo pair directly with the MTX 191 (A) matrix amplifier.  The XY or MS signal is then available at the 5-pin XLR output connector of the MTX 191 (A), and the recording angle can be electrically remote controlled.  The output stages KM 100 are then not required.


  • Removable mic capsules, functional up to 50 m from the output stage
  • Great variability through capsule extensions and goosenecks
  • Switchable 10 dB pre-attenuation
  • Transformerless circuitry
    Technical Data:
    • Acoustical operating principle: Pressure Gradient Transducer
    • Directional pattern: Cardioid
    • Frequency range: 20Hz to 20kHz
    • Sensitivity at 1 kHz into 1 kohm: 15 mV/Pa
    • Rated impedance: 50 ohms
    • Rated load impedance: 1000 ohms
    • Equivalent SPL CCIR 468-3: 25dB
    • Equivalent SPL DIN/IEC 651: 16 dB-A
    • S/N ratio CCIR 468-3: 69 dB
    • S/N ratio DIN/IEC 651: 78 dB
    • Maximum SPL for THD 0.5%: 138 dB
    • Maximum SPL for THD 0.5% with preattenuation: 148 dB
    • Maximum output voltage: 10 dBu
    • Dynamic range of the mic amplifier, (A-weighted) DIN/IEC 651: 122 dB
    • Supply voltage (P48, IEC 61938): 48V +or- 4V
    • Current consumption (P48, IEC 61938): 2 mA
    • Matching connector: 3-pin XLR-F
    • Weight: 80 g
    • Diameter: 22 mm
    • Length: 92 mm
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