Shure KSM9
A handheld condenser for vocalists, meant to handle the quiet parts as well as the loud ones.
Overview
Shure built the KSM9 to get around two old complaints: that a condenser can't survive a stage, and that a stage mic can't pick up a whisper. According to Shure's own documentation, it's the first handheld condenser with dual diaphragms and switchable polar patterns, and the company has leaned on that claim since the model's introduction. The design pairs two 3/4-inch gold-layered, low-mass Mylar diaphragms with a transformerless Class A preamp. It works like a studio mic, but it's built to be gripped, dropped, and howled into.
The two patterns are cardioid and supercardioid. Shure's manual notes that the frequency response of the two is nearly identical, so a performer can switch patterns mid-set and the mic still sounds like the same mic. Shure recommends the cardioid setting for singers using in-ear monitors, where a warm, full sound and strong gain before feedback matter more than isolation. The supercardioid tightens the coverage angle to 115 degrees and pushes maximum rejection to 120 degrees off-axis. That's the setting for loud rooms and crowded stages where everything is bleeding into everything else.
The dual-diaphragm design does more than enable pattern switching. Shure's literature credits it with taming proximity effect, the bass bloom that creeps in as a singer closes on the grille. The manual is candid that proximity effect still exists, but the design minimizes it, so a performer can work the mic at varying distances without the low end lurching around. A singer can lean in for a quiet verse and pull back for a belt without the engineer riding the low-cut.
The spec sheet reads like a serious condenser. Frequency response runs 50 to 20,000 Hz. Output impedance is 150 ohms actual, sensitivity is rated at −51 dBV/Pa, self-noise at 22 dB SPL-A, and signal-to-noise ratio at 72 dB. Maximum SPL is 152 dB at 1 kHz at 1% THD whether the preamp sees a 2500-ohm or 1000-ohm load, and dynamic range holds at 130 dB either way. Shure recommends a minimum input load impedance of 1000 ohms and notes that higher impedance gives better performance on the SPL, clipping, and dynamic-range figures.
Power comes over phantom. The mic is specified for 11-52 V DC phantom power per IEC-61938, drawing 5.2 mA maximum. Shure notes that it will operate at lower voltages, but headroom and sensitivity drop slightly. A proper 48 V supply is the right home for it. Common-mode rejection is ≥60 dB, which helps in a room full of dimmers and wireless gear.
Mix (July 2006, p.13) ran the KSM9 in its pages as a handheld condenser built to unite studio and stage, with the dual-diaphragm design and switchable patterns positioned as the tools that let it reveal nuance in demanding live environments. That's advertising copy as much as editorial, and it should be read that way — but it does describe the design intent accurately. Pro Audio Review (November 2007, p.45) carried the same pitch a year later, adding that the KSM9 capsule was also available with Shure's UHF-R wireless system, which is the detail that matters most for working vocalists: the same capsule can live on a wired mic one night and a wireless handheld the next.
The mic weighs 300 grams - 10.6 ounces - light enough to hold for a long set but heavy enough to feel like a real microphone. The grille is a three-stage mesh that Shure bills as an integral pop filter, cutting wind and breath noise. The manual says some performers will still want an external windscreen when close-miking. Internally the mic uses gold-plated connectors, and the suspension shock mount is designed to isolate the cartridge from handling and stand noise. The "ShockStopper" trademark appears in Shure's notices, and the claim is that it virtually eliminates handling noise even in demanding live situations.
Two versions exist. The standard KSM9 offers cardioid and supercardioid patterns in charcoal gray or champagne finish. The KSM9HS swaps in hypercardioid and subcardioid patterns and comes in black. The champagne and charcoal grilles have separate replacement part numbers (RPM260 and RPM262 respectively), and the cartridge itself is RPM160. Furnished accessories are an aluminum carrying case (A9SC) and a microphone clip (A25E), with an A85WS foam windscreen offered separately.
The KSM9 is not a cheap microphone and was never positioned as one. The dual-diaphragm, switchable-pattern condenser formula puts it in premium territory, and Shure's own materials describe it as a premium vocal microphone rather than a general-purpose workhorse. What it offers in return is two patterns with matched response, high SPL handling, low self-noise, and a shock mount that keeps stage noise out of the signal.
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