Shure KSM 27
A side-address condenser that put a gold-layered 1" diaphragm and a discrete Class A front end within reach of project studios.
Overview
The KSM 27 is Shure's cardioid, side-address studio condenser. The spec sheet reads like a serious recording tool, not a budget compromise. It uses an externally biased, 1" gold-layered diaphragm and a Class A, discrete, transformerless preamplifier. Collectors tend to fixate on that transformerless Class A front end. It's the same architectural family Shure built into the wider KSM line, and the design intent is a fast transient response with no crossover distortion, rather than the colored, transformer-coupled sound of older studio condensers.
The capsule sits behind an integrated three-stage pop protection grille. Shure also built an internal shock mount into the body, so the mic doesn't strictly require an external suspension mount to control handling noise. The frequency response runs 20 Hz to 20 kHz, and self-noise is spec'd low. A subsonic filter knocks down mechanical rumble below 17 Hz, and the mic ships with a protective pouch. It can handle an input level of 137 dB. That's respectable headroom for a large-diaphragm condenser, and it puts loud sources like close-miked amps and drums within range without instantly overloading the capsule.
Two switches give the KSM 27 its working flexibility. A 15 dB pad handles high-SPL sources, and a three-position low-frequency roll-off filter lets the user tame proximity-effect buildup at the source rather than in the mix. With the pad, the roll-off and the subsonic filter, the mic is set up to be placed close to loud, bass-heavy sources and still come back usable.
Contemporary coverage treated the KSM 27 as the value entry into Shure's side-address condenser family. Mix (2002, p.122) reviewed the cardioid-only KSM 27 alongside its multi-pattern siblings. It called the all-American-made mic one of the best values around and noted its low 14 dB self-noise figure. The same review positioned it against the KSM44 and KSM32. The KSM 27 is the fixed-cardioid, single-pattern member of that side-address group, where the KSM44 adds externally biased dual-diaphragm construction and a three-position low-frequency filter for proximity control, and . The KSM 27 is the cardioid-only option, not a stripped-down afterthought.
Engineers used it as a workhorse rather than a specialty piece. Mix (2006, p.73) documents a session account that places a KSM 27 alongside an SM57 on guitar amps. It was a dependable cardioid that could go on toms, guitars and amps and hold its own next to the dynamics already in the locker, not a flagship vocal condenser. One EQ (2005, p.52) comparison found the KSM 27 a touch thin on a very loud, dark guitar source where a drier, thicker character was wanted. On aggressive high-SPL sources, the mic's clean, detailed sound isn't always the coloration an engineer is chasing.
Shure's own advertising leaned hard into the value pitch, billing the KSM 27 in Mix (March 2006, p.17) as "one serious piece of equipment" that was "amazingly affordable." That's marketing copy, not an independent verdict, but it tracks with how the review press framed the mic. A 1" gold-layered diaphragm, a discrete Class A transformerless circuit, switchable pad and roll-off, and an internal shock mount add up to a lot of microphone for the money. The trade-offs come with a clean, cardioid-only condenser: no pattern options, and a voicing that favors detail over thickness on the loudest, darkest sources.
Anyone chasing a KSM 27 today should treat it as a working tool first. The design is straightforward and the feature set is practical. It delivers the KSM family's core engineering - the gold-layered diaphragm, the Class A front end, the three-stage grille and internal shock mount - without the multi-pattern complexity of the KSM44.
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