Rational Acoustics RTA-420 Measurement Microphone with Calibration Files | Reverb
dbx DriveRack PA2 Loudspeaker Management Kit with RTA-M
DPA Microphones 4090 High Sensitivity Omnidirectional 4090 B&H
Found a microphone at the venue I work at, some kind of reference microphone? Help identifying? No distinguishing marks on box or microphone. : r/livesound