However, as an exception to this, there are some active ribbon microphones in production that do require phantom power. In general, Ribbon microphones are passive so do not require phantom power. Ribbon microphones use a thin metal 'ribbon' (often aluminium) placed between a pair of magnets in order to convert sound energy into electrical energy. Note that, even with phantom power on, the mic's signal will still need pre-amplification the 48V supply is simply there to charge the condenser mic's capsule and power active electronic components. This voltage is commonly referred to as phantom power. Condenser mics require a DC power supply (transmitted through an XLR cable) in order to operate the active components used and therefore, a voltage (48V, but can range from 44V to 52V) is sent down the XLR cable to power the microphone. Sound pressure waves then move the diaphragm back and forth relative to the solid backplate.Īs the capsule is too fragile to connect directly to other audio gear and outputs almost no electrical current, active circuitry is needed to amplify the signal. The capsules found in Condenser (sometimes referred to as capacitor or electrostatic) microphones consist of a thin membrane (diaphragm) in close proximity to a solid metal plate. This movement through the magnetic field generates a voltage, which is proportional to the sound waves being received at the diaphragm. Dynamic microphones convert sound energy into electrical energy using a diaphragm linked to a coil of wire that moves through a magnetic field.
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