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Dimensions
The Heil HM-10 Dual microphone is 7 and 3/16 inches tall and 2 and 1/8 inches in diameter at the widest point. The height is measured from the thin bottom end to the top of the spherical grille that crowns the microphone. The microphone gets gradually thinner toward the bottom of the unit.
Elements
The Heil HM-10 has specifications of both the HC-4 and HC-5 microphones. These were developed in 1983 and use voice coil bobbins wound with copper. The HC-4 element has the -3dB points set at -600Hz and 6,000Hz, and the peak tuning is at +10dB, centered at 2,000Hz. The HC-5 element has its -3dB points set at 300Hz and 5,000Hz. The tuned peak on the HC-5 is +6dB, centered at 2,000Hz. These elements are both designed for talking within one to two inches from them and have an impedance of 1,000 ohms at 1 kHz. The HC-4 has a sensitivity of -66dB, while the HC-5's sensitivity is -68dB.
Buttons
The microphone features two main buttons for its operation. The "Wide/Narrow" switch, located beneath the word "Heil" on the front of the microphone. The unit also has a Heil Sound "Light Touch" push-to-talk (PTT) button, which can be found directly underneath the "Wide/Narrow" selector switch.
Connections and Accessories
The Heil HM-10 Dual has a four-pin XLR connection built in and is usually supplied with a microphone clip and foam wind screen. Different accessories can be bought that are compatible with the unit. The CC-1 series Heilwire cable is required to connect the unit to most transceivers and converts the four-pin XLR cable to an 8-pin Mic plug. You can also purchase the SM-1 Shock Mount to prevent vibrations from nearby appliances from being pickup up by the unit and the SB-2 Short Boom for mounting the microphone.