Shure SM5C
A unidirectional dynamic built for the boom, with a 100 Hz high-pass filter that keeps stage rumble out of the signal.
Overview
The SM5C never got the marquee treatment of an SM57 or SM58, but it solved a specific problem for broadcast and location work: the low-frequency junk that creeps in when a microphone lives on the end of a moving boom. Shure's own catalog copy describes it as a unidirectional dynamic with a 100 Hz high-pass filter. The stated purpose is blunt - keep subsonic transients from overloading input stages or dragging down the signal-to-noise ratio.
The problem is physical. A boom arm swings, a stand gets bumped, wind crosses the grille, and the capsule sees a wall of energy well below anything a voice or instrument is producing. Left alone, that energy eats headroom at the preamp and shows up as mud, or as a compressor working overtime on nothing musical. The SM5C's onboard high-pass rolls that region off before it reaches the console. On a boom-mounted microphone in broadcast or mobile recording, that is not a luxury feature. It is the difference between a usable track and a fight.
Contemporary trade listings place the SM5C in Shure's UK catalog at £176.40, just above the SM5B at £168.60. Both are listed as moving-coil, cardioid-pattern models with 150-ohm and 50-ohm impedance respectively. The SM5C's sensitivity is quoted at 84 dB against the SM5B's 79.5 dB. The listings describe the SM5C's mounting as boom, with the 100 Hz high-pass called out as its distinguishing feature. That price put it near the top of Shure's UK range at the time - well above an SM58 at £63.60 or an SM57 at £49.80, and roughly level with the SM7 at £151.80.
The microphone turns up in some unexpected company. Shure's advertising through the mid-1970s ran a campaign built around the Rolling Stones' mobile recording studio, and the SM5C appears in the list of Shure microphones the band relied on, alongside the SM53, SM58, SM33, and SM54. The copy, which ran in the trade press, framed the microphones as the band's "assurance of consistent quality and natural sound" in a session or on stage. That is marketing and should be read as such. Recording-Engineer (August 1972, p.47) announced the model's introduction in its new-product pages, describing it as a boom microphone built to solve the problem of subsonic transients - the same framing Shure used in its own literature.
By the available documentation, the SM5C is not a studio condenser or a vocal showcase piece. It is a moving-coil dynamic with a cardioid pattern and a filter, and it does a narrow job. Collectors and working engineers who know the model tend to describe it in practical terms: a problem-solver for boom work, not a desert-island microphone. Its design brief was explicitly about removing something the engineer did not want.
Original pricing and the model's presence in Shure's UK distribution suggest it was sold into broadcast, film, and location-recording channels more than into the consumer or project-studio market. The 100 Hz high-pass fits that work. It is high enough to catch boom handling and wind noise, and low enough to leave a male voice largely intact. Engineers who have used the model describe the filter as doing its job without calling attention to itself.
On the collector side, the SM5C is a niche piece. It does not command the prices or the following of Shure's vocal and instrument dynamics, and parts and documentation are thin compared to the SM57/SM58 family. Buyers should expect to find them through broadcast-equipment channels and estate sales more often than through the usual microphone marketplaces. They should also verify the filter works. A high-pass that has drifted or been bypassed turns the SM5C into a plain cardioid dynamic and removes the reason to own it.
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