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HiVi BN4 Anodised Aluminium / Magnesium Midbass Drivers
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The drivers in these metal enclosure Tandy / Realistic / Radio Shack Minimus 77 speakers, had been burnt out when a chip amp decided to deliver pure DC. So I upgraded the drivers to these metal cone varieties. The magnets (neodymium) are big partly due to the shielding which is done with magnetic repulsion. The cones are ultra-light and very rigid and the surrounds compliant. Power rating is 25WRMS and under listening tests, in the enclosures, go down to 100hz. The over-all sound is bright (see other image). The crossover is 1st order and additional dampening was added to the box.
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