Microtech Gefell - 3D Audio News

Mono, stereo, surround+3D - the new measurement Microphone application 9.1. 3D audio

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The new, universally usable 3D application for live recording from Microtech Gefell is ideally suited for high-end 3D audio recording in the field of live events / ambient sound recording, as well as a recording solution for churches (e.g. St. Peter's Church Leipzig), theatres, large studios for orchestras, choirs, bands and concert halls.

This is evidenced, for example, by recordings of a concert in the Kulturpalast Dresden or performances in various churches such as Ilmenau, the Peterskirche in Leipzig or a concert with Prof. Ludwig Güttler, the world's leading solo trumpeter, in the church in Waldsassen.

In the field of innovative 3D sound solutions, Microtech Gefell cooperates closely with R&D partners such as the Leipzig University of Applied Sciences (HTWK Leipzig), the Institute for Media Technology at Ilmenau Technical University or the Fraunhofer Institute for Digital Media Technology (IDMT) within the framework of joint projects.

Highlight 2019 - M Cube - Microphone System for 3D recordings

The M Cube is a 9-channel microphone system for time-delay based 3-dimensional recordings. The 9 microphones are arranged in the shape of a cube with a length of approximately 1 meter each side.

The microphone positions are adjustable – so the dimensions of the microphone arrangement can be adjusted to the dimensions of the room and the sound source. The mounting barshave distance markings, so that any setting can easily be repeated.

The M Cube is set up as a 5.0 array with another 4 microphones for height information. 5 M 102 capacitor microphones are used for the lower plane and four M 221 capacitor microphones for the upper plane.

All the microphones are omnidirectional. Because of this, the frequency response is independent from the distance to the sound source and there is no proximityeffect; sensitivity to wind noise is very low.

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The use of certified WS1F- and WS2F- measurement capsules, combined with a 48 V phantom powered preamplifier (that internally raises the capsule bias voltage to the required 200 V) reaches a constant magnitude and phase response according to the tight tolerances of DIN EN61094-4, with transmission properties that are longtermstable. Only the diameters of the capsules and the noiselevel of the M 102 and the M 221 are different, all other transmission properties and the construction of both microphones are identical. Because of the high microphon sensitivity, a lower level of preamplification is necessary. This results in a lowernoise level in the recording.

The optional use of the acoustic equalisation balls KA 3 and KA4 for the M 221 results in an additional acoustic amplification in the high frequencies. Dueto the use of metal diaphragms, the microphones are very insensitive to changes of humidity in the air. All parts of the capsule – including the diaphragm – are made of nickel, so they are very insensitive to temperature changes.

A standard sound calibrator can be used to supply the microphones with an accurately defined sound pressure level. Thereby all the microphones can be adjusted to an equal amplification and also the following equipment can be optimally adjusted to the expected sound pressure level at the microphone position.

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