Shure A27M Stereo Microphone Adapter Broadcast Recording

The Shure A27M is a stereo microphone adapter designed to mount two microphones on a single stand with independently selectable positions. In stereo recording and broadcast applications, the ability to precisely set the angular relationship between two microphones is the entire technical basis of stereo image width and depth — and the A27M gives engineers mechanical control over that relationship. The adapter supports the full range of standard stereo miking configurations: XY coincident pairs (typically ±45° for a 90° included angle), ORTF-spaced pairs (17cm separation, ±55° angle), and custom spaced arrangements for wide stereo imaging. Because it is a passive mechanical device, it adds nothing to the signal path — no noise floor, no impedance loading, no coloration. Its contribution to a recording is purely positional.

In the studio, the A27M earns its keep in overhead drum recording, acoustic guitar stereo pairs, choir and ensemble miking, and broadcast setups where a clean, minimal stand configuration matters. It is a practical, no-fuss tool that keeps a stereo rig tidy and reproducible. Shure's construction is solid — the mounting hardware does not loosen under vibration or repeated adjustment, and the standard 5/8-inch thread fits any professional stand without needing a thread adapter. The design is best matched to small-diaphragm pencil condensers, which are the industry standard choice for stereo pairs in most of these applications. Engineers using large-diaphragm microphones in stereo configurations should verify that their specific mic body diameter fits the mounting clips before committing.