Neumann KM100
A modular miniature condenser system that earned a TEC Award nomination and a permanent place on hi-hat stands and orchestral catwalks alike.
Overview
The KM100 is not one microphone. It is a system: a family of very small, exceptionally efficient condenser mics built around interchangeable capsules on a common output stage. Neumann's own advertising for the line leaned on the adjectives the industry expected from the company, and added a few more: small, versatile, and compatible with a huge range of accessories. That last point is the whole idea. Most small-diaphragm condensers lock you into a single polar pattern. The KM100 lets you screw on a different head and change the microphone's entire personality.
Collectors and engineers talk about the modular architecture first. The system pairs capsule assemblies with a shared preamp body, and the range of available heads is what makes it a kit rather than a mic. The active-capsule concept pushed the idea further. Neumann's AK20 active capsule for the KM100 system offers a figure-of-eight pattern without the usual two-diaphragm construction. According to Neumann, the single-diaphragm approach sidesteps the arrival-time differences between two surfaces that can color conventional switchable mics, and the company specifically notes that the frequency response curves are identical at 0 and 180 degrees. The AK20 can be used as a detached capsule on its own, or fitted directly to the KM100 output stage to form the KM120 miniature microphone.
The transformerless 100-series electronics are the other half of the story. Neumann later folded this circuit family into the integrated KM184, a non-modular cardioid that paired the classic KM84 capsule with 100 Series transformer-less electronics. That is effectively the same capsule-and-electronics pairing the modular KM100 range had already made available. Mix (July 1995, p.171) noted the pairing when the KM184 launched at a $599 list, framing the new mic as a way to get KM100-style sound in a simpler, cheaper package. Neumann built a whole product around what the modular system could do, minus the interchangeable heads.
Live, the pattern repeats: the kind of tight, low-profile placement where a miniature mic earns its keep. In a 500-series preamp shootout, EQ used a KM100 as a mono overhead and again on a Martin HD28v acoustic guitar.
The line got an official stamp in 1989, when the Neumann KM100 was nominated for a TEC Award in the Transducer Technology category, alongside the Bruel & Kjaer 4011 and the Shure Beta 58. A nomination is not a trophy.
Know what you are buying. The KM100 is a system, and a complete one - body plus a selection of capsules plus the mounting hardware - is a different proposition from a single orphaned body. The heads unscrew, so used examples can arrive mismatched, and the active-capsule accessories like the AK20 are their own separate acquisitions. The KM100's relative youth within that catalog works in an owner's favor, but the modular nature means condition varies enormously from one example to the next.
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