The E100S is a supercardioid, large-diaphragm FET condenser microphone with the lowest self-noise of any microphone we've seen to date: 3.7 dBA.
The mic's capsule is an edge-terminated, large-diaphragm design. The diaphragm is a 4-micron polyester film, metallized (via vapor deposition) with nickel rather than the more traditional gold. The diaphragm diameter is approximately 24mm; the outside diameter of the capsule assembly is 25.9mm.
The capsule is imported from longtime CAD associate and supplier.
CAD E100S and boxSwitches on the front of the mic body provide a -10dB pad and a high-pass filter (6dB/octave at 80Hz).
The mic's input stage has been described as a "quadra-FET" design. It has four FETs, the specific selection and application of which are part of the secret of the mic's extremely low noise floor.
The output is transformerless. Described as a "twin 5087 output driver," it incorporates two bipolar transistors, one for the positive signal and one for the negative.
The amplifier design is fully differential, which allowed for the omission of a phase-splitter circuit that could have limited the performance of the microphone.
The circuit board is made in the US, and is the result of about 18 months of development by CAD, according to company VP of Engineering Kelly Statham.
CAD E100S and boxThe mic ships with a low-profile "stealth" shockmount in a padded cherrywood storage case.
As part of CAD's "USA Series," the E100S was designed and is assembled and tested in the US, using components sourced locally as well as abroad.