However, the appearance of a terminus compromised the former ideal of the perfect non-resonant transmission line. The stuffing inside increased air density, slowed sound propagation and made the line behave longer than it physically was. This signaled the launch of more practical TLs which now became shorter to fit into smaller cabinets. īy 1965, Bailey designed a line with a terminus and used fibrous stuffing rather than the absorptive lining of his predecessors. King shows on his website, a full-length line for a driver with an F1 (resonant frequency) of 29.3Hz would have to be 11.7 meters. Pioneering inventors like Olney (1930) and Stromberg-Carlson (1950) accomplished this with huge and very large sealed labyrinths behind their drivers. Regardless of whom you ask, everyone agrees on the theoretical ideal of a TL (the short-form moniker for a transmission line): A virtual black hole behind a driver absorbing all its rear-firing out-of-phase energy. industry features: Terminus LongusĪ recent Internet thread began with the query "What defines a transmission line?" Though it might seem obvious at first - most of us have certain notions about what constitutes a loudspeaker transmission line - upon further inspection, this question is far more trying than apparent.
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