AKG D-112

A dynamic kick-drum mic so overload-proof that the test bench gives up before the microphone does.

Overview

AKG designed the D-112 as a dynamic microphone for miking bass instruments. The company's own documentation lists the maximum sound pressure level as unmeasurable. That's an admission that the measurement rig runs out of headroom before the microphone does.

The D-112 exists for the kick drum, the most punishing source in a typical studio. The manual is candid about why dynamic microphones dominate this job: the moving system of a dynamic transducer can be engineered to handle high excursions with very high mechanical linearity, which is what a bass drum and a bass guitar cabinet demand. The D-112 descends from AKG's earlier D 12, which the documentation credits as widely known for handling high-level signals from bass drums and bass guitar amps. The D-112 carries that lineage forward and absorbs very high transient signals with essentially no distortion.

The frequency response shows what AKG was chasing. The 20 Hz floor reaches down to where kick drums and bass cabs live. The high-frequency response is deliberately tailored so that a bass drum and a bass guitar stay distinguishable from one another in a mix. That's a design decision, not a flat-response philosophy.

Mix (March 1987, p.44) made the case in characteristically blunt terms, calling bass instrument miking the hardest job in the world and noting that explosive transients, extreme SPLs, and low fundamentals conspire to obscure the mid and high-frequency overtones that carry the instrument's identity. The same piece reported computer analysis indicating virtually zero distortion up to 168 dB — a number that reads less like a specification than a dare. Mix also noted built-in emphasis at 100 Hz and 4 kHz, which is the tailoring the manual describes in plain language: a lift down low for weight, a lift up top for definition. Studio Sound (March 1986, p.46) announced the D-112 as a new dynamic bass microphone joining the D12 in AKG's range, with preliminary information pointing to a new type of dynamic transducer. An earlier Studio Sound notice (July 1986, p.153) framed it as the result of technical wizardry and engineering experience, promising punchy, powerful bass reproduction with accuracy.

That's a modest output, typical of a moving-coil dynamic, and it means the D-112 wants a preamp with real gain.

The construction is as utilitarian as the application. The sound entry side is marked by a green bumper band. That detail appears in every language version of the manual. It also appears in Sound and Communication (October 1987, p.17), which ran a piece titled "What's Black and Green and Heard Everywhere" positioning the D-112 kick drum mic as part of the D 300 Series family of microphones.

The D-112 is not a neutral instrument microphone. The tailored high end and the emphasis at 100 Hz and 4 kHz mean it flatters bass sources and makes no apology for it. On a kick drum or a bass cab it does what the design promises. On a snare or a vocal it will give something else entirely, and that's not a defect.

Collectors and working engineers tend to treat the D-112 as a tool rather than a trophy. It shows up in studios constantly, it gets used hard, and it keeps working. The green bumper band fades and the enamel chips, and the microphone still does its job. The manual lists the maximum SPL for 0.5% THD as unmeasurable.