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further developments
After VSAC 97 Doc was approached to design a series of speakers intended for the Chinese market. High sensitivity was not to be considered a high priority.
During the intervening months Doc had been dealing with the new product development person at MCM. In one conversation it was disclosed that the manufacturer of the original 5" aluminum cone driver was developing a new driver, and Doc put in his 2 cents. The result was the 55-1870, a 5" aluminum cone driver with a much larger 17 oz (vs. the original 8 oz.) magnet, a curvilinear cone, and a rubber surround.
The new driver was less efficient, only 87 dB, but much smoother and more extended at both ends of the frequency spectrum, with an honest 54 Hz to 15 kHz response.
Several designs were developed with various numbers of these drivers, the most efficient being about 92.5dB @ 1W @1M. We show the designs here to give an idea of their simplicity, but due to the possibility of their future release as a commercial product, we are unable to offer any design specifications.
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