Studio-grade silence. Pristine clarity. Serious headroom.

The Shure KSM40C is a state-of-the-art, large-diaphragm cardioid condenser microphone built for engineers and producers who demand the best. Featuring a 1" single-diaphragm capsule, an astonishingly low self-noise of 7.5 dBA, and a maximum SPL of 153 dB, the KSM40C handles the full spectrum of recording challenges — from the most delicate whispered vocal to the most punishing high-SPL instrument.

Exceptional Noise Performance

With a self-noise floor of just 7.5 dBA, the KSM40C is among the quietest large-diaphragm condenser microphones available at any price. This extraordinary sensitivity means that subtle vocal nuances, the breath of a flute, the decay of a piano note, and the finest details of any acoustic performance are captured with startling clarity. Engineers who have tracked quiet vocals through the KSM40C have described moments of double-checking whether the microphone was even active — that is how low the noise floor is.

Natural, Mix-Ready Sound

The KSM40C's 1" precision-engineered capsule with its proprietary backplate design eliminates sharp resonances for a natural, detailed audio reproduction. Its frequency response from 20 Hz to 20 kHz is smooth and accurate, delivering rich low-end body and high-frequency detail without artificial brightness or harshness. The result is a microphone that captures performances with the tonal honesty and mix-readiness that professional engineers rely on.

Massive Headroom

The KSM40C handles up to 138 dB SPL before the pad and 153 dB SPL with the -15 dB attenuation pad engaged, giving it extraordinary dynamic range and headroom for the loudest studio sources. Close-miked snare drums, brass instruments, guitar amplifiers, and even kick drums are well within its capability. This makes the KSM40C a true all-rounder that eliminates the need to reach for a different microphone on high-SPL sources.

Complete Professional Bundle

The KSM40C ships with a full suite of professional accessories. The proprietary shock mount with silicone suspension system isolates the capsule from stand vibrations and structure-borne noise. The detachable magnetic pop filter clips on instantly and provides effective plosive control. A swivel-mount clamp, threaded adapter, and premium carrying case complete the package, so the KSM40C is ready to deliver professional results straight out of the box.

Ideal Applications

The KSM40C is particularly well suited to vocal recording, where its low noise floor and natural voicing allow the singer's performance to shine without flattery or colouration. It also excels on upright bass, guitar amplifiers, kick drum, piano, acoustic instruments, and broadcast or voiceover applications where pristine, uncoloured audio is essential.