Tannoy HPD 385A (mid-1970s)
Not much is documented about the Tannoy HPD 385A as a stand-alone unit. Period dealer advertising does place it, though. It was the largest driver in Tannoy's HPD series from the mid-1970s, a 15-inch chassis rated at 85 watts.
An advertisement for newly appointed Tannoy industrial dealers Eventide Clock Works in Studio Sound (January 1976, p.47) lists the HPD 385A as the driver in Tannoy's two biggest new enclosures - the ARDEN, handling 85 watts, and the BERKELEY at 75 watts. A London Speaker Centre stock list in the same magazine (September 1977, p.67) offers the bare chassis at £112.85, described as a 15-inch, 85-watt unit.
The usual technical detail is missing. No frequency response, sensitivity or crossover figures for the 385A survive in the sources consulted, and no period review of the driver itself has turned up. The HPD range also included the HPD 295A and the 12-inch HPD 315A. The 385A sat at the top of that family and powered the largest of Tannoy's new domestic enclosures of the era.
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