offset driver with the space occupied by the driver as a throat would give an approximation. looks like some old school TL take off
Try to search TQWT , it's seems similar .
Voight Pipe probably was the first speaker like a TQWT .
TQWT has at the end of the line a reflex tube-duct , Voight Pipe no (like this ...).
For many years an English company called Castle made TQWT with open end or with thin opening end .
Sorry for my English ...
Voight Pipe probably was the first speaker like a TQWT .
TQWT has at the end of the line a reflex tube-duct , Voight Pipe no (like this ...).
For many years an English company called Castle made TQWT with open end or with thin opening end .
Sorry for my English ...
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