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This 'systems engineering' approach involved extensive research to meet design goals for specific Thiele-Small parameters that would offer the user a wide range of choice of low frequency response, efficiency and compact size. Successful completion of this development program has resulted in a family of bass reflex cabinets from the compact 1,5-cubic foot Model 8127, to the 24-cubic foot Model 8182, which is used for extended low frequency response. Careful vent design provides sufficient cros