Voice Coil
The M4 voice coil is edge-wound aluminum which is copper-flashed to allow proper solder joints on the beryllium copper lead-in wires. It is placed on the inside of an aluminum former. This in turn is fastened to the aluminum lower skin of the diaphragm. The consistent use of aluminum throughout the voice coil yields tremendous thermal conductivity, and conducts heat away from the voice coil area. Since voice coil impedance rises with heat (and less amplifier power is drawn), the M4 's impedance remains stable, even at full amplifier power. Power compression is less than 1 decibel at full rated power (200 watts).
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