Beyerdynamic M500N (c. 1978)
Not much information on the Beyerdynamic M500N survives. Nearly all of it comes from one period review. Audio (February 1978, p.91) listed the "Model M500N (C)" as a current microphone in its equipment review section. It was a pressure-gradient design with a 40 - 18,000 Hz response within 2.5 dB of nominal, an integral windscreen, a four-stage pop and blast filter, and an individual chart record supplied with each unit. The spec header also noted a built-in Switchcraft M3M (or equivalent) male connector.
The same review's measurements (p.92) found the polar pattern essentially independent of frequency from 0° to ±90°, with a null at 120° to 135°. Sound quality changed little within a useful pickup angle of 0° to ±45°. That is tighter than a cardioid's ±60°, and in line with the review's hypercardioid characterization. Measured output impedance was 255 ohms.
- Operating principle: pressure gradient
- Frequency response: 40–18,000 Hz within 2.5 dB
- Connector: built-in Switchcraft M3M (or equivalent) male
- Features: integral windscreen; four-stage pop and blast filter; individual response chart supplied
- Measured output impedance: 255 ohms
No pricing, production dates, or further historical context have turned up in the available record.
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