Heil Sound revolutionized amateur radio audio with their tailored response HC Series elements in 1982, which allowed the non-DSP transmitters of that era to produce different transmit responses by selecting the right microphone element.
Fast-forward 30 years. Bob Heil has designed the new Heil HC-6 that, by adjusting the DSP EQ of the modern transceivers, will produce Beautiful, full range broadcast audio as well as narrow response contest/DX audio of the Heil HC-4 all from this one specially designed dynamic microphone element. The many 'voices' of the HC-6 are truly amazing.
Using a .82 inch diameter Mylar diaphragm, the - 3dB points of the wide frequency range is set at 100Hz and 12.5 kHz. With sensitivity of - 57dB at 600 Ohms nominal output impedance centered at 1 kHz. The HC -6 Audio response can be equalized to match just about any requirements.