Importance

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Abstract

The multi-filar moving coil loudspeaker includes a magnetic field structure which provides a unidirectional magnetic flux across an air gap, an acoustic diaphragm, and a coil set positioned in the air gap and connected to the diaphragm. The coil set has a plurality of insulated coils wherein the coils have approximately the same resistance and inductance and cut substantially the same flux lines in the air gap. The coil set has two or more wires which are twisted around one another and then wound about a coil form. The coils in the coil set may be connected in series or parallel aiding, or in series bucking pairs. In a loudspeaker circuit, the coils are connected into two groups, each having one or more coils. The first group is connected to input terminals, and the second group is connected to a feedback amplifier having an output connected to the first group of coils. The amplifier may be a constant voltage amplifier having an output connected in series with the first group of coils, or a constant current amplifier connected in parallel with the first group of coils. In the first case, a further inductance may be connected in series with the first group of coils and in the latter case a capacitance may be connected across the first group of coils.

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First Claim