* 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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*According to IEC 60268-1; CCIR-weighting according to CCIR 468-3, quasi peak; A-weighting according to IEC 61672-1, RMS
**Reference signal at 94 dBSPL

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* 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

The post Neumann KM 185 D Stereo Set (Pair of KK 185 Hypercardioid Capsules and KM D Output Stages) appeared first on Arqen Acoustics Store.

 
Applications

The U 87 Ai condenser microphone is a large diaphragm microphone with three polar patterns and a unique frequency and transient response characteristic.

Acoustic Features

The U 87 Ai is addressed from the front, marked with the Neumann logo.  The frequency response of the cardioid and figure-8 directional characteristics are very flat for frontal sound incidence, even in the upper frequency range.  The microphone can be used very close to a sound source without the sound becoming unnaturally harsh.  By means of a high-pass filter interferences through subsonic and low frequencies are reduced remarkably.

Polar Patterns

The dual-diaphragm capsule is elastically mounted and protected by a large headgrille.  A switch below the headgrille selects the three directional patterns: omnidirectional, cardioid and figure-8.  A window above this switch shows the symbol of the selected characteristic.

Electrical Features

The letter A in the name indicates a more recent generation, as compared to the U 87 i microphones that were built from 1967 to 1986.  Modifications apply to the electronic components of the microphone only; the capsule remained unchanged.

The present-day circuitry increases the operational headroom of the U 87 Ai by supplying the bias voltages for the capsule through a reduced resistance.  The result is a higher sensitivity of 10 dB for identical sound pressure levels, and an improved S/N ratio of 3 dB.

Filter and Attenuation

A switch located at the rear attenuates the sensitivity by 10 dB.  When this switch is activated, the microphone accepts sound pressure levels up to 127 dB (equivalent to a sound pressure of 45 Pa) without distortion.

An additional switch at the rear allows to change the microphone’s cutoff frequency.  This reduces low frequency interference directly at the input of the microphone amplifier.

This setting also compensates for the unavoidable bass boost that occurs with all pressure gradient transducers when they are used at close distance (proximity effect).

The cardioid characteristic maintains a smooth frequency response at a distance of 30 to 40 cm, the figure-8 characteristic even at a distance of 15 to 20 cm.

Features:

Specifications:

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The U 89 i is similar in appearance to the U 87.  It is of smaller size, and lighter weight.  It features five instead of three directional characteristics and a higher maximum sound pressure level which make this microphone easier adaptable to different applications.

Polar Patterns

In addition to the usual directional polar patterns: omnidirectional, cardioid, and figure-8, Neumann has added a hypercardioid and wide-angle cardioid characteristic.  When compared to the standard cardioid pattern, the hypercardioid characteristic suppresses sound from the side more efficiently.  The wide-angle polar pattern is especially useful to record large sound sources.

Acoustic Features

The microphone is addressed from the front, marked with the Neumann logo.  The large diaphragm capsule has a very smooth frequency response for all polar patterns over a wide acceptance angle.  The frequency response curves are flat up to 10 kHz within a pickup angle of ± 100°.

As a result the U 89 i has a very even diffuse-field response for all polar patterns.  This is important in a reverberant environment when more reflections arrive at the microphone capsule.  The acoustic information is not affected in its tonal quality when recorded by the microphone.

This characteristic is achieved without resorting to corrective resonance effects.

The capsule it is elastically mounted to avoid any structure borne noise that could interfere with its operation.

Filter and Attenuation

The amplifier handles sound pressure levels up to 134 dB without distortion.  With a self noise level of 17 dB (A-weighted) the total dynamic range is 117 dB.  Maximum sound pressure level is 140 dB when the – 6 dB rotary switch is in the ON position.

A low frequency roll-off at 80 Hz or 160 Hz can be activated with another rotary switch below the headgrille.  This filter suppresses low frequency interference, yet maintains an even frequency response for close-up sound sources, for example, when proximity effect could adversely affect the program material.

A steep high-pass filter in the LIN position prevents the output transformer of the microphone from being overloaded due to undesired subsonic frequencies.

Operational Safety

All exposed surfaces of the microphone capsule, including the diaphragms, are at ground potential.  This technology makes them highly immune to electrical and atmospheric interference and contamination through microscopic dust particles.

Features:

 
Specifications:

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The Idea

The KU 100 dummy head is a replica of the human head with a microphone built into each ear.

When the recorded audio signal is reproduced through high-quality headphones the listener perceives a sound image almost identical to the one he would have heard at the recording location of the dummy head (head-related stereophony).

When played back through loudspeakers, the sound matches to a high degree that of conventional stereo microphones, placed in the same position. However, a superior quality is added, that of a distinct spatial depth perception.

The KU 100 dummy head is just as easy to use during creative radio drama productions, and music recordings where the room acoustics should be recorded at the same time.

The dummy head is also contributed essentially as an important tool to preserve natural sounds of all kinds. In addition, the dummy head is frequently used to examine and document the influence of noise in industrial applications at various working places under realistic conditions.

Electrical Features

The KU 100 uses transformerless circuitry with the advantage of high output capability, fast transient response, and extremely low self noise. The usual output transformers are replaced by electronic circuits. As with traditional transformers, this technique ensures good common mode rejection, and prevents RF interference, that may influence the balanced audio signals.

The dummy head provides balanced (XLR) and unbalanced (BNC) outputs. It can be powered in three different modes:

 
Filter and Attenuation

A 10 dB switch inside the head attenuates the sensitivity. A second switch selects the cutoff frequency of the high-pass filter to be either linear, 40 Hz, or 150 Hz.

Delivery Range

The KU 100 comes in a robust aluminum carrying case, together with an external power supply unit, a 5-pin XLR cable, and an adapter cable that splits the 5-pin XLR output into two 3-pin XLR connectors.

Features:

 
Specifications:

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