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Vintage D-104 microphone head. Introduced in 1933, the Astatic model D-104 became known for its high frequency response that contributed to better communications audio quality. Early D-104 mikes used a 1" thick case, a large ID tag, and holes for "ring & spring" mounts. The design was modified in April 1937 with smaller tags and reduced thickness.
Download QR code; Print/export ... Appearance. move to sidebar hide. D104, D. 104, or D-104 may refer to: D104 road, a ... a road in Croatia; D-104 microphone, a ...
As such it is more usual to perform reciprocity calibration in an acoustical coupler, and then apply a correction if the microphone is to be used in free-field conditions; such corrections are standardised for laboratory standard microphones (IEC/TS 61094-7) and are generally available from the manufacturers of most of the common microphone types.
An electret microphone is a microphone whose diaphragm forms a capacitor (historically-termed a condenser) that incorporates an electret. The electret's permanent electric dipole provides a constant charge Q on the capacitor.
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A parabolic microphone is a microphone that uses a parabolic reflector to collect and focus sound waves onto a transducer, in much the same way that a parabolic antenna (e.g. satellite dish) does with radio waves. Though they lack high fidelity, parabolic microphones have great sensitivity to sounds coming from one direction, along the axis of ...
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The Turner Microphone company was founded by David Turner and Everett Foster in Cedar Rapids, Iowa in 1931. The company soon began making microphones and public address systems . Turner opened a larger factory in 1936 and produced a large quantity of microphones and grew to 1200 employees by the 1970s.