An isolation network is described for combining low frequencies and providing -center-fill- in a -three loudspeaker- two channel stereo reproducer. A high degree of isolation is afforded between channels for any degree of center-fill. Three decibels greater efficiency and less crosstalk are realized as compared to the dual voice coil method. Applications to various stereo systems are described.
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https://aes2.org/publications/elibrary-page/?id=401
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