AKG D-109

Not much information on the AKG D-109 survives, but what there is agrees. It was AKG's omnidirectional dynamic microphone, aimed at speech and general-purpose use. A directory entry in HI-Fi-Stereo-Buyers (1974, p.101) gives sensitivity of −56 dB ASA, response of 50-15,000 Hz ±3.5 dB, and 200 ohms impedance. It also notes the D-109 shipped with a lavalier, dust filter or windscreen, and a 30-ft cable. An earlier microphone roundup in Audio (August 1967, p.80) listed the D-109 as the omni member of AKG's dynamic line, next to the cardioid D-202E. The D-109 still showed up in listings as late as 1974.

Past those directory entries, almost nothing is documented about how the D-109 was received, what it cost, or exactly where it sat in AKG's lineup. If you have original literature or a well-worn example, it would help fill in one of the quieter pages in the archive.