Audiophilepure

https://www.whathifi.com/us/reviews/pmc-twenty523i

PMC has always promoted transmission line bass loading over the use of reflex ports or sealed cabinets, and things are no different here. The idea is that the rear-firing sound from the mid/bass driver passes through a folded path inside the speaker cabinet. 

This path is carefully lined with damping materials so that all but the lowest frequencies are absorbed. These frequencies exit from the opening at the base of the front panel and augment the bass from the drive unit. It’s important to note that the transmission line’s output is in-phase with the drive unit.

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