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Single Permanent Magnet Co-Axial Loudspeakers

Co-axial loudspeakers are designed with a single ring permanent magnetic structure assuring dual flux path for the two voice coil gaps. Internal magnet is used in two realizations with parallel flux division at both its diameters. These two varieties are convenient for Nd magnets and one of them has its local internal flux path crossing two gaps in series for dual membrane compression driver implementation. Another realization uses an external permanent magnetic structure with series flux through the gaps. Proposed co-axial loudspeaker types are very compact, simple, and lightweight. They all can use “Stepped Gap” designs for their low frequency voice coils. Comparative measurements with conventional co-axial loudspeakers reveal competitive performance with much reduced weight and production cost.

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AES - Audio Engineering Society