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HiVi D5.4-II 5" Poly Cone Neodymium Woofer 4 OhmThe Hi-Vi D5.4-II is a very handsome and very versatile mid-woofer. The D5.4-II utilizes a one-piece polypropylene cone and dust cap, attached to a smooth-transition natural rubber surround. This combination makes for a very extended and smooth frequency response to beyond 5kHz with virtually no cone break up issues. The internal motor system using NdFeB magnets and 52mm diameter aluminum voice coil former and wire reduces moving mass while increasing power handling. The cast aluminum frame and oversize spider round things out, making this a very attractive and durable mid-woofer with loads of clean, linear displacement capability.
Not too much bass but HiVi's frequency plot looks super flat to 5K.