The TSPs help the design of such units choose the appropriate speaker driver for the speaker unit design. Speaker units (as in the full-range 2-way and 3-way PA, bookshelf, studio monitor speakers, etc.) are generally built from ready-made drivers.
The manufacturer includes these parameters to present speaker designers with data that will aid in producing speaker units with the driver. In this article, we’ll discuss the universal parameters (fundamental, small-signal, large-signal and enclosure parameters) as well as the lesser-known parameters and even select manufacturer-specific parameters. Though many of the parameters are listed by manufacturers today, some manufacturers have created their own parameters to help describe their speakers. Many others have contributed to the list of T/S parameters since Thiele’s original series in 1961 and Small’s publishings beginning in 1972. Small of the University of Sydney, who pioneered these specifications for analyzing loudspeakers. T/S parameters are named after Albert Neville Thiele of the Australian Broadcasting Commission and Richard H. Thiele-Small parameters are a subset of speaker specifications found on the datasheets of individual drivers and, sometimes, drivers with enclosures. I will also include examples when appropriate.
In this article, I’ll emphasize the common parameters and describe all the potential TSPs we may find on a specifications sheet. Some are more common (apply to more speakers) than others. There are many Thiele-Small Parameters to be aware of. The TSPs apply particularly to individual drivers and enclosures (vented or ported) and give us specifics about how the speaker design and performance. What are Thiele-Small Parameters? Thiele-Small (T/S) Parameters are a series of measurements that define the mechanical, electrical and electromechanical properties of a loudspeaker. Speaker drivers and enclosures are quite complex in their design and functionality and can be measured in a wide variety of specifications and parameters.
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