ADK Hamburg II AU Details ADK Hamburg II-AU and Vienna II-AU models are based on a unique FET circuit that saturates gradually (unlike most condenser microphones which tend to clip abruptly). Both Products now boast Australian-Designed Capsules, British Oxford Transformers, Hi-End Phillips Norelco Uber-FET. Manufactured with Hi-Fi Methods and Materials, including a $3 Resistor! It took three microphone experts including a PhD in Physics, a Design Genius in Belgium and a 40 year-old Mic Locker to create it! Add Two-Way Attenuation Pads (8 and 16 dB) to enable end-user to taylor the dynamic behavior of the microphone to the situation and obtain new textures, with rarely the need for outboard processors or even EQ.