An reasonably priced reference mic you’ll be able to construct your self

Reference microphones are vital tools for audio work. They are prized for their flat frequency response and are often used to describe the acoustic response of a room or space. OpenRefMic aims to be an open source design for manufacturing reference microphones without paying exorbitant retail prices.

At the heart of the build is a standard 48 V phantom powered preamplifier that is responsible for both the electret microphone element and acts as a buffer for the microphone signal. It is specifically designed to work with the AOM-5024L-HD-FR PUI mic capsule, selected for its good performance and low noise characteristics. However, other electric mics should also work. Hardware encased in a 3D printing box can easily be done on most basic printers. It comes complete with a well-fitted grille to hold the microphone in place.

The primary objective of the project is low noise; project creator, [loudifier], note that most commercial reference mics focus first on flat frequency response and then on noise reduction. OpenRefMic does a good job in this area, and the lack of a completely flat frequency response will be rectified with calibrated equalization. It also works with regular professional-grade XLR cables and phantom power, instead of needing lab spec cables and interfaces.

The end result is credit to [loudifier], who demonstrates an in-depth understanding of reference microphone design principles. We have seen some other great cheap reference mics recently too!

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