Transmission line speakers!

I’ve had custom transmission lines for 32 years. Even if I ever try another pair of speakers at some point, they’ll most likely use a TL. They’re more difficult to build and to get right than many speakers, but when done well, the lack of resonance can be spectacular from the low bass all the up into the midrange....the midrange can be one of the strongest benefits of a TL (lots of variables, obviously).  Add good higher frequency drivers and a well executed crossover, and you have the makings for impressive fidelity that most speakers struggle to match.

Khorn. A transmission line with a fold or two. Just my interpretation, as I am no speaker designer. PWK could have ported it, but would not get the efficiency of a true horn, nor the quality of output. Transmission loaded, ime, always had folds within the cabinets, otherwise, it was simply ported.

The K-Horn does have some folds, but is not functioning as a true 1/4 wave T-Line. It’s more like a wave guide or horn to help amplify certain ranges of the bass for efficiency gains, as opposed to absorbing resonance and allowing deeper bass from a given driver. Very different principles with different purpose and execution of the folds.