California microphone manufacturer Josephson Engineering has announced a special anniversary model in their Series Seven studio microphone line, the C720. To mark our 20th year the C720 is being made in a limited edition of only 20 units.

The C720 features a variant of the dual-diaphragm capsule used in the C700 series of microphones. Each side of the capsule has its own dedicated audio channel. The front and back signals are brought out to individual 3-pin XLR connectors. The two signals can be mixed in different ratios to produce any desired directional pattern from omni through wide cardioid to cardioid, hypercardioid and figure-8.

A unique and patent-pending feature of the C720 is that the grille surrounding the capsule is made not of the usual perforated metal sheet or woven wire mesh, but is made instead of a new material, hard open-cell metal alloy foam. Having a structure very similar to the open cell plastic foam used in microphone windscreens, this metal foam basket can be made in one piece having uniform acoustic characteristics in all directions.

The circuit of the C720 is derived from the e22S microphone, and has Josephson's unique cascode front-end directly driving a custom Lundahl output transformer. Polarization charge for the capsule is provided by a new electrostatic circuit that does away with oscillators and external power supplies.

The C720 will be available in time for the 124th AES Convention in Amsterdam.

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