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The loudspeaker parameters describe most of the electrical and mechanical properties of the driver. These Discus Thiele & Small parameters are listed for enthusiasts using CAD speaker enclosure design software in order for other types and sizes of subwoofer enclosures can be quickly designed. An internet search will yield at least ½ dozen or more “freeware” software programs. Quickly comparing these CAD programs shows most do a good job and have short learning curves. Totally understanding the acoustical theories behind them could take some serious studying!