DAVID CLARK HEADSET/M-1/DC AMPLIFIED DYNAMIC MIC/5' STRAIGHT CORD/HINGED WIRE BOOM/NRR 24dB (H10-30) In 1975 David Clark Company introduced the first headset specifically designed to provide hearing protection for pilots while also providing clear, isolated reception and crisp transmission at normal voice levels in a noisy aircraft. The following is the most complete line of noise attenuating aviation headsets available anywhere.