Abstract: A voice coil assembly for a speaker comprises a substrate, a spiral pattern coil formed on the substrate, at least one holder fixedly secured to the periphery of the substrate, and at least one metallic layer attached to said substrate. The metallic layer facilitates the dissipation of the heat generated by the voice coil, while a pair of metallic layers establishes electrical connections between the voice coil terminals and external terminal strips. The shape of the opening of the holder(s) may be made other than rectangular for avoiding the occurrence of standing waves which cause the frequency characteristic of the speaker to be deteriorated.

Abstract: A multi way speaker system comprises an amplifier, frequency dividing network including a plurality of filters, a plurality of speakers respectively responsive to the output signals of the filters, and a summing circuit responsive to the output signals of the filters for producing a composite signal to be fed back to the input of the amplifier to establish a negative feedback loop. Because of the feedback loop undesirable influences by various elements included in the filters are diminished and thus the speakers reproduce audio frequencies with high fidelity. At least one equalizer may be employed in the feedback loop, while auxiliary filters may be used in such a manner that the output terminals of the auxiliary filters are connected to only the summing circuit so that the output signals of the auxiliary filters are added to an output signal of at least one filter of the frequency dividing network.