Binaural/Stereo Compatible "Dummy-Head" Microphone

(Sphere Stereo Microphone)

    Sphere ESLAB   
  • Novel, head-related stereo main microphone for Headphone and Loudspeaker reproduction
  • Very good imaging and sense of depth; good localization, very natural sound
  • With qualities of a dummy head when headphones are used for listening
  • Superior low-frequency performance.
  • Sphere Stereo microphones are distinguished by the simplicity of the recording technique and of the setup: Only two channels are required, and with the ESLAB Sphere only one microphone cable is needed. With the sphere microphone the interaural differences are similar to those occurring at the human head. This explains why a sound image quite similar to that for a listener at the microphone position is obtained, with the room (ambience) included.

The Sphere Stereo Microphone ESLAB is the embodiment of a newly-developed stereo main-microphone design using an plastic acoustic baffle. "Dummy head" systems are well-known for the excellent results they can provide, but the recordings made with such systems are suitable for headphone listening only.
The "Sphere" microphone was developed so that comparable results could be achieved for loudspeaker playback.
Such a microphone would not only provide interaural arrival-time cues, but also spectral-vs-angular incidence information.
Electrostatic Headspeaker

In constructing the Sphere Stereo Microphone ESLAB two special pressure transducers are mounted flush on the surface of a light plastic sphere 15 cm in diameter, an acoustic baffle having especially favourable properties. Normally two omnidirectional capsules placed so close to each other would not provide a convincing stereo image. However, the sphere between the capsules creates a frequency-dependent emphasis of intensity differences, comparable to that naturally occurring at the ears of a human head.

The frequency response on the stereo main axis of the Sphere is flat when measured at the output of either channel. If a sound source moves around the sphere, the intensity in the one channel will increase by the same amount as it decreases in the other.
The frequency response of the energy sum is constant for the direct and the reverberant sound fields.

These features, combined with exceptional linearity that extends to the very lowest frequencies, are responsible for the remarkably natural impression of space, depth, and image typical of the ESLAB Sphere Microphone.

Information about the ESLAB:
  • The stereo pickup angle is about 90°.
  • The ESLAB can operate into unbalanced inputs and without transformers.


ACCESSORIES Power Supply/Equalizer, Microphone Cable (included).


The following data were measured on the raxis of the capsules.
Classification of the special capsules: pressure transducer
Recording angle for full stereo reproduction: 90°
Frequency range: 18 Hz-20 khz
Sensitivity: 100 mV/Pa (10 mV/mu bar)
Equivalent noise level, CCIR: 28 dB
Equivalent noise level, A-weighted: 21 dB-A
Maximum sound pressure level for 0.5% THD: 117 dB SPL
Output voltage at maximum SPL: 0.8 V
Source impedance: 600 Ohm
Minimum recommended load resistance: 6000 Ohm
Powering: 1.5 battery (included)
Current consumption per channel 0.05 mA
Weight: appr. 0.2 kg
Diameter of the sphere: 150 mm

Price US$390.00

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