Built many of them for an assortment of different drivers. Basic a folded tapered pipe in which the throat is =Sd in area and the mouth (not the port) is 4-5x Sd and the length is 1/4 wave length of the target Fc(which will only work if its a straight pipe). Advantages over a straight MLTL is a smoother FR curve as the harmonics in the upper range are closer together. Disadvantages are that the Fc is higher. Usually Lowthers are BHL (back horn loaded) or BLH whichever term you perfer. However they can be used in a folded pipe if adequate BSC (baffle step compensentation)can be employed or equaliziation is used. I presently design and build single driver full range BLHs for Fostex applications, well full range i guess if you dont count the ribbon tweet i have with the 208e sigma. IMO they should be used in BLHs for the optitum performance. Do a "Google" on Lowthers and Lowther America. ron
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