Search Gear


September 2, 2008


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. As with other microphones in the
Series Seven, Josephson Engineering suggests that the microphone channels be recorded
on individual tracks so they may be combined in mixdown and the ratios adjusted to
produce any desired pattern, after the session has been recorded. With the C720 the
pattern can be selected by ear in the best situation possible to achieve the sound the user
prefers, rather than requiring that a selection be made from a limited range of options in

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. Conventional
microphone grilles need a support structure of rings and bars of solid material – this
structure causes problems due to the reflections inside the basket that can occur. The
metal foam provides mechanical support, electrical shielding and a degree of pop
filtering. The C720 metal foam grille is acoustically highly transparent and needs no
support structure, so internal reflections and ringing are greatly reduced – providing a
cleaner sound from 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 initially be available only from Josephson Engineering dealers in Europe
and Australia May 5th in time for the 124th AES Convention in Amsterdam. Worldwide
sales will start approximately 10 weeks after that. Contact or refer


Want to read more stories like this?
Get our Free Newsletter Here!
Show Comments

These are my comments.

Reader Poll

Do you participate in crowdfunding?

See results without voting »