The dummy head has its place, even in the age of surround sound. It is highly recommended by some audio engineers for the rear channels.
The KU 100 dummy head is a binaural stereo microphone. It resembles the human head and has two microphone capsules built into the ears. When listening through high-quality headphones it gives the illusion of being right at the scene of the acoustic events.
When using the KU 100 dummy head, the binaural stereo experience moves the listener into the scene of the original performance, in contrast to other space-related recording techniques, where the acoustic event is moved to the listener.
The dummy head is also used in many industrial applications as a measuring device, for example in acoustic research. The KU 100 can be operated with typical 48 V phantom powering, or from an external power supply unit, or from the built-in battery.
At the bottom of the unit is a switch for the different power supply modes, as well as connectors for balanced and unbalanced output signals. Inside the head are additional switches for 10 dB attenuation and the high-pass filter.
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:
from an external P 48 phantom power supply,
with batteries as part of the internal battery supply,
or from an external AC mains supply (included with the system).
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.
- Dummy head for head-related stereophony
- Pressure transducer with flat diffuse-field frequency response
- Loudspeaker compatible
- Transformerless circuitry
- Two-stage switchable low frequency roll-off
- Switchable 10 dB preattenuation
- Balanced and unbalanced outputs (XLR and BNC)
- Acoustical operating principle Pressure transducer
- Directional pattern Ear
- Frequency range 20 Hz ... 20 kHz
- Sensitivity at 1 kHz into 1 kohm 20 mV/Pa
- Rated impedance 50 ohms balanced, 200 ohms unbalanced
- Rated load impedance 1 kohms
- Equivalent noise level, CCIR1) 29 dB
- Equivalent noise level, A-weighted1) 16 dB-A
- Signal-to-noise ratio, CCIR1) (rel. 94 dB SPL) 65 dB
- Signal-to-noise ratio, A-weighted1) (rel. 94 dB SPL) 78 dB
- Maximum SPL for THD 0.5%2) 135 dB
- Maximum SPL for THD 0.5% with preattenuation2) 145 dB
- Maximum output voltage 1950 mV
- Dynamic range of the microphone amplifier (A-weighted) 119 dB
- Supply voltage (P48, IEC 61938) 200 ... 240 V / 48 V ± 4 V / 6 x 1.5 V
- Current consumption (P48, IEC 61938) 2 x 2 mA
- Matching connector XLR3F / XLR5F
- Weight 3500 g
- Height 280 mm
- Width 180 mm
- Depth 220 mm
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1) according to IEC 60268-1; CCIR-weighting acccording to CCIR 468-3, quasi peak; A-weighting according to IEC 61672-1, RMS
2) measured as equivalent el. input signal
