miniDSP UMIK-1
The UMIK-1 is miniDSP's omni-directional USB measurement microphone. It's calibrated, needs no driver, and plugs straight into a computer for room correction and speaker measurement. It's still in production, so it isn't vintage in the usual sense. It's here because it has become the default reference tool for DIY room tuning, and because the record on it is thinner than you'd expect for something so widely used.
Here is what's solidly documented. The capsule is a 6 mm electret, omni-directional, flat from 20 Hz to 20 kHz (±1 dB with the calibration file loaded). The ADC is 24-bit, running at 44.1 or 48 kHz. The interface is USB Audio Class 1.0, driverless on Windows, Mac, and Linux. Each unit ships with a unique calibration file keyed to its serial number, covering frequency, amplitude, and sensitivity drift. There are on-axis and 90-degree variants. The 90-degree file is the one you use when the mic points at the ceiling, which is the normal setup for multichannel and immersive calibration. miniDSP's own documentation for integration with Dirac Live is explicit about the workflow: connect the mic, note the serial number on the body, download the matching calibration file, and load it before measuring. The mic can also be used for SPL monitoring under Room EQ Wizard, and a standard 1/2" sound level calibrator threads on directly.
A few specs are uncertain. Maximum SPL is quoted as both 105 dB and 130 dB depending on the source, and self-noise appears as 31 dBA from only one listing. We've left both out of the summary rather than pick a winner. The connector is usually described simply as USB, though at least one dealer lists USB-C. The official description only commits to USB Audio Class 1.0. iPad and iPhone use requires a Lightning-to-USB camera adapter, and Android compatibility is inconsistent across brands. The kit includes a USB cable and, per at least one dealer, a tripod. Current retail runs around €110. The UMIK-1 is the cheaper, smaller-capsule sibling to the UMIK-2. The larger UMIK-2 capsule starts to go directional at high frequencies, which some users consider a point in the UMIK-1's favor.
Compatibility is the reason it's everywhere: REW, Dirac Live, Audyssey, FuzzMeasure. There are anecdotal user complaints about inconsistent unit-to-unit quality, though the sources don't say what specifically failed or how common it is. No production years are documented, and no original launch price is recorded.
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