Neumann KM 184
A $599 small-diaphragm condenser that promised the sound of a KM 140 - and turned out to be its own, subtly different thing.
Overview
Word got around that Neumann was bringing out a small-diaphragm cardioid condenser at a $599 list price. Working engineers had seen this before. Mix (July 1995, p.171) put it plainly: the prospect of a KM 140 soundalike for that money was exciting. The KM 184 was no mystery box. Neumann re-combined parts it already had on the shelf, and everybody knew it.
The recipe, as EQ (October 1994, p.20) reported at the mic's introduction, was to pair the cardioid capsule from the KM 84 with the transformerless electronics of the KM 100 series. The name gives it away: KM 84 capsule, KM 100-series circuit, hence KM 184. EQ (December 1994, p.16) confirmed the same lineage in its own writeup, noting that the KM 184 employs the same cardioid capsule as its discontinued predecessor. It is a small-diaphragm condenser pitched at critical recording and sound reinforcement work.
The spec sheet never promised that the KM 184 would sound identical to the KM 140, and it doesn't. Mix (July 1995, p.171) compared the two side by side and found them subtly different, attributing the difference to both electrical and acoustical causes rather than any single change. So it is not a clone and not a downgrade. It shares its parentage with two of Neumann's small-diaphragm designs and has its own voicing.
The numbers, as published in EQ (December 1994, p.16): a frequency response of 20 Hz - 20 kHz, sensitivity of 15 mV/Pa, and a rated source impedance of 50 ohms. The signal-to-noise figures are quoted both ways, 69 dB CCIR-weighted and 78 dB A-weighted, referenced to 1 Pa at 1 kHz. Dynamic range is listed at 122 dB, and maximum input SPL at 138 dB for a THD under 0.5%. That SPL ceiling means the KM 184 will sit in front of a snare or a close-miked guitar cabinet without folding, while the low self-noise implied by the A-weighted figure keeps it usable on quiet sources. It runs on 48 volts phantom power, ±4 volts.
Physically it is small, 107 mm long with a 22 mm body diameter, per the same EQ spec block. The compact body makes placement easy in tight spots, and the transformerless circuit keeps the package light and simple.
Where the KM 184 turns up tells you most of what you need to know about its reputation. Studio gear lists from the period show it in serious company and in quantity: EQ's studio profiles place pairs and quads of KM 184s alongside M 149s, TLM 170s, and U 87s at facilities ranging from SSL-equipped tracking rooms to Pro Tools-based project studios. It appears as a two-mic purchase in some rooms and a four-mic purchase in others — the pattern of engineers who found it useful enough to buy more than one. That is the quiet verdict on any microphone: not that it was reviewed well, but that people kept reaching for it.
It is a known quantity: a cardioid small-diaphragm condenser with published specs and a documented family tree running back through the KM 84 and KM 100 series. It is not the mic for the exact KM 140 sound, and Mix (July 1995, p.171) said so directly. It is a clean, transformerless cardioid that will handle a 138 dB source and still behave on a quiet one.
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