C716 Specifications
Type: Electrostatic pressure/pressure-gradient
transducer
Marking: In accordance with IEC 61938
Rated power supply: Phantom 48 ±4 volts, 5 mA max.
in accordance with IEC 61938
Internal impedance: <80 ohms
Rated impedance: 200 ohms
Minimum load impedance: 1k ohms
Sensitivity: 26 mV/Pa (-32 dB ref 1V/Pa)
Frequency Range: 20-20,000 Hz
Directional characteristics: cardioid
Overload sound pressure: 134 dB SPL at 1000 Hz
Equivalent sound pressure due to inherent noise:
15 dB SPL, A-weighted rms in
accordance with IEC 60268-1
the rear of the microphone toward a specific unwanted
sound source, rather than trying to point the front
precisely at the desired sound.
The C716 incorporates a true dual diaphragm capsule.
Even though only the front diaphragm is electrically
active, the presence of the rear diaphragm produces
improved pop and plosive handling abilities compared
with similar single-diaphragm designs.
Vocal performers can use the microphone at any
distance from nearly touching the grille to many
meters away in the reverberant sound field. In addition
to the metal foam grille, a very fine internal screen
protects the capsule from breath sounds and moisture,
although an external pop screen may be needed in
some cases. Proximity effect yields flat frequency
response at about 75 cm (30”) with some low
frequency boost for closer sources, and low frequency
rolloff for more distant sources.
About the C716 Circuit
Like most Josephson microphones, the C716 uses an
all-discrete class-A circuit to transform the high
impedance of the capsule to a suitable level for
interface with mic preamps and consoles. A cascode
stage made of large-geometry field effect transistors
directly drives a pair of matched PNP bipolar
transistors in balanced emitter-follower configuration.
The emitter leads of the transistors are brought out
directly through a common-mode choke; the phantom
resistors in the powering equipment form the load
resistors of the mic circuit. The output impedance is
very low, and the output level can be quite high due to
the low loss nature of the circuit. High output level can
overload preamps and mixers when used close to loud
Summary of Contents for C716
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