The present invention relates to a crossover network capable of implementing accurate symmetric frequency division at a crossover point by eliminating capacitors that adversely affect sound quality and employing only one transformer, and to a multiway speaker system and audio system using the same. The crossover network according to the present invention receives an audio signal and separates it into two frequency bands of a low frequency audio signal and a medium frequency audio signal, and the low frequency audio signal is applied to a low frequency speaker, and the medium frequency audio signal is a medium and high frequency speaker. And a first transformer applied to the first transformer, wherein the first transformer includes a primary coil having one end wound around the core and the other end connected to the input end of the low-range speaker; And a secondary coil having one end grounded after being wound around the core and the other end connected to the input end of the middle and high-pitched speaker.
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