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Audio & Sound Equipment » Microphones/DI boxes » Hard Wired Microphones » Studio, Stage, Instrumental, Microphones » Condenser Microphones, Stand Mount » Condenser, Modular Style, Preamps and Capsules and Systems

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Neumann KM145-SET
Cardioid Mic System with low frequency roll-off, -10dB pad, clip, windscreen and case

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Cardioid Mic System with low frequency roll-off, -10dB pad, clip, windscreen and case

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Neumann KM145-SET

The variable condenser miniature microphone system consists of several active microphone capsules with different directional characteristics, an output stage, and numerous accessories.

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.

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.

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

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
AK 45 is a pressure gradient transducer with cardioid characteristic, similar to the AK 40. However, it has an acoustic bass roll-off that is useful during applications when subsonic and low frequencies may cause difficulties. The AK 45 is optimized for a flat low frequency response at a recording distance of 15 cm (“speech cardioid”).

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.

KM 100 F Output stage
The KM 100 F output stage is an alternative to the KM 100 output stage. In contrast to the KM 100 output stage with a flat frequency response, the KM 100 F attenuates frequencies below 80 Hz at 6 dB/octave. This eliminates or suppresses interference caused by wind or structure-borne noise.

A built-in slide switch allows to raise the cut-off frequency (-3 dB point) from 80 Hz to 120 Hz. An additional slide switch lowers the sensitivity by 10 dB.

Specifications

Acoustical Operating Principle: Pressure Transducer
Directional Pattern: Cardioid with low frequency roll-off
Frequency Range: 20Hz-20kHz
Sensitivity (1kHz into 1 kohm): 14 mV/Pa
Rated Impedance: 50 ohms
Rated Load Impedance: 1000 ohms
Equivalent SPL CCIR 468-3: 26 dB
Equivalent SPL DIN/IEC 651: 17 dB-A
S/N ratio CCIR 468-3: 68 dB
S/N ratio DIN/IEC 651: 77 dB
Maximum SPL for THD 0.5%: 138 dB
Maximum SPL for THD 0.5% with preattenuation: 148 dB
Maximum Output Voltage: 10 dBu
Dyn. range of the mic amplifier DIN/IEC 651: 121 dB
Supply voltage: 48V +/- 4V
Current Consumption: 2 mA
Matching Connector: XLR 3F
Weight: 80 g
Dimensions (D x L): 22mm x 92mm

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