Reference microphones are essential tools for vocal work. They are rated for their flat frequency response and are often used to characterize the acoustic response of a room or space. OpenRefMic aims to be Open source design for production of reference microphones Without paying exorbitant retail prices.
The heart of the design is the standard 48V phantom-powered preamplifier, which is responsible for both biasing the electrical microphone element and acting as a microphone signal buffer. It is specially designed to work with the PUI AOM-5024L-HD-FR microphone capsule, selected for its good performance and low noise characteristics. However, other electric microphones should also work. The device is packaged in a 3D printed case that can be easily fabricated on most basic printers. It is equipped with a snap-fit net that holds the microphone capsule in place.
The main objective of the project is the low noise level; project’s holder, [loudifier], notes that most commercial reference microphones focus on flat frequency response first, then noise reduction. OpenRefMic does well in this area, and its lack of a completely flat frequency response is offset by a calibrated EQ. It also works with standard, pro and phantom power XLR cables, rather than the need for fancy lab cables and interfaces.
The end result is a credit to [loudifier], which demonstrates a solid understanding of reference microphone design principles. We saw A few other great low cost reference mics lately too!
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