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Neumann KM 143
Mini Condenser Mic System: AK 43 Wide Angle Cardioid Capsule with -10dB pad, KM 100 Output Stage and Accessories

OUR PART #:  KM143-SET

Neumann's KM 143 miniature condenser microphone system consists of an AK 43 wide angle cardioid microphone capsule with -10 dB pad, a KM 100 output stage...
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Neumann KM 143
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Neumann's KM 143 miniature condenser microphone system consists of an AK 43 wide angle cardioid microphone capsule with -10 dB pad, a KM 100 output stage, an SG 21 bk stand mount, a WNS 100 windscreen, and a woodbox.

Through the modular construction of mic 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.

Construction

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

The AK 43 is a pressure gradient transducer with wide-angle cardioid characteristic. Attenuation at 90° is 4 dB, at 135° it is 8 dB and at 180° it is 11 dB. The frequency response curves for sound sources within an angle of ± 90° are parallel up to 12 kHz.

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.

Preattenuation

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.

Connectors

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 new 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 be available also 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.

Features:

  • Active capsules, detachable up to 50 m from the output stage
  • Great variability through capsule extensions and goosenecks
  • Switchable 10 dB preattenuation
  • Set includes windshield and microphone clamp
  • Transformerless circuitry

Specifications:

  • Acoustical Operating Principle: Pressure Gradient Transducer
  • Directional Pattern: Wide Angle Cardioid
  • Frequency Range: 20Hz-20kHz
  • Sensitivity (1kHz into 1 kohm): 15 mV/Pa
  • Rated Impedance: 50 ohms
  • Rated Load Impedance: 1000 ohms
  • Equivalent noise level CCIR*: 25 dB
  • Equivalent noise level, A-weighted*: 16 dB-A
  • S/N ratio CCIR* (rel. 94 dB SPL): 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 microphone amplifier, A-weighted: 122 dB
  • Supply voltage (P48, IEC 61938): 48V +/- 4V
  • Current Consumption (P48, IEC 61938): 2 mA
  • Matching Connector: 3-pin XLR-F
  • Weight: 80 g
  • Dimensions (Dia. x L): 22 x 92 mm

*According to IEC 60268-1; CCIR-weighting acccording to CCIR 468-3, quasi peak; A-weighting according to IEC 61672-1, RMS
**Measured as equivalent el. input signal

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