The D4-1 speaker kit comes with the 4" (100 mm) Tang Band W4-1617 full range speaker driver. The driver is constructed on a die-cast aluminum basket with a large under-hung neodymium magnet motor system. The cone is paper made from sugar-cane fiber and mounted with a rubber surround. Full technical specifications are available on the Tang Band W4-1617 driver datasheet. The noted sensitivity of 89dB / 1W / 1m is optimistic - I measured about 86 dB with a radio shack 33-2050 sound pressure level meter.
W4-1617 Full Range Speaker Driver
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