Condenser microphones are more sensitive than Dynamic microphones. They use an electrically-charged diaphragm & backplate assembly to form a sound sensitive capacitor. When sound sets the diaphragm in motion, the distance between the diaphragm and the backplate changes. This variation in spacing changes the capacity of the capacitor, and produces the needed electrical signal. All condenser microphones need to be powered: either by batteries in the microphone or by externally provided phantom power. . Miniature instrument microphone delivers high gain-before-feedback and rejection of unwanted noise. It features preamplifier circuitry to improve linearity across the full frequency range, and tailored response for natural sound reproduction.. The BETA®98H/C and the wireless version WB98H/C are premium cardioid condenser instrument microphones that clamp onto the bell of wind instruments or onto the rim of percussion instruments..