The Tannoy Monitor HPD series was released in 1974 and produced until around 1980. Distinguishing physical features of this model are:
This model is often confused with the Monitor Gold because the chassis is painted gold. However, the Monitor Gold did not have the plastic-foam roll-surround of the HPD-series (except on some very late-model Monitor Golds), nor the "girdacoustic" low frequency cone.
The Monitor HPD was available in three models:
See also cabinet designs for these drive-units
The HPD-series was the last model in the classic series first launched in 1947. All models from the Monitor Black through the Silvers, Reds, Golds and lastly the HPD's uised the same basic design with minor refinements to LF cone surrounds, dustcovers, rear-loading of the HF diaphragm.
Perhaps the most significant performance changes were achieved through the use of more sophisticated crossovers on the later models like the Monitor Gold's and Monitor HPD's.
Desirable features of the HPD series are:
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