C715 schematic diagram
C715 Specifications
Type: Electrostatic pressure/pressure-gradient transducer, omni and
cardioid characteristic
Rated power supply: Phantom 48 ±4 volts, 5 mA max.
Internal impedance: 100 ohms
Rated impedance: 200 ohms
Minimum load impedance: 1k ohms
Sensitivity: 1.8 mV/Pa (-55 dB ref 1V/Pa)
Frequency Range: 20-20,000 Hz
Directional characteristics: continuously adjustable omni to cardioid
Overload sound pressure: 140 dB SPL at 1000 Hz
Equivalent sound pressure due to inherent noise: 19 dB SPL, A-
weighted rms in accordance with IEC 60268-1
The Josephson
C715
is part of the Series Seven range of large
diaphragm side-address microphones. It uses a capsule with a single
large diaphragm, with an adjustable rear port to select between
cardioid and omnidirectional patterns.
A unique feature of the
C715
is its open-cell metal foam grille,
subject of our US Patent 8,005,250. Unlike traditional microphone
housings made of perforated metal or wire screen with reflective
metal support structures, this highly open material protects the
capsule mechanically, provides electrical shielding and some pop
and wind screening without needing any additional support
structure. A fine, acoustically transparent screen inside the grille
helps protect the capsule from breath moisture when the
C715
is
used as a vocal mic. We were able to avoid using a traditional
basket support structure because the foam itself is a tough self-
supporting aluminum alloy. It’s a highly open structure so that
internal reflections are negligible, while the metal still provides full
protection for the capsule. Traditional designs incorporate rings and
bars to support the basket material, leading to the reflections shown
in the left illustration.
These reflections in turn introduce acoustic resonances in the
microphone response, which contribute to frequency response and
Summary of Contents for c715
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