The instrument
The AKG D 3600 microphone was probably launched in 1991 as part of a whole range of dynamic vocal and instrumental mics.
Details
The D3600 has two capsules, mounted in an IsoDamp isolation system. One capsule is forward facing and handles only the high frequencies, while the other is facing into the body, to pick up the bass end. The outcome is a microphone that exhibits very little proximity response and has a wide, relatively flat frequency response ranging from 20Hz to 22kHz.
The presence peak on this microphone is amounting to around 4dB in the 3-5kHz region. The capsule provides a response that is almost ruler flat from 40Hz up to 1kHz. Because of the extended bass response, a bass rolloff switch is provided, which starts a very gentle roll-off just below 1kHz. Sound Pressure Levels of up to 156dB can be accommodated with only 3% THD, making the D3600 eminently suitable for use with drums, including bass drums, as well as brass instruments and loud guitar stacks.
(Source: muzines)