INFINITY WTLC WAVE TRANSMISSION LINE
This is the only one that I could find. A wave transmission line. I would have to take the driver out and look. Simple as that.
I don't see a fixed throat for the exit port. I guess the hole in the back is the port?
They may use TL tech but in the stricter sense of a TL speaker design, not so much. It's like calling a QLS1 a Line source when the only one they ever produced was the IRS Beta V. Everything was not quite the same or a hybrid of some kind.
As far as deep bass, TL make good bass, the problem is like any speaker that has bass in the same box as the monitor section, timing is the issue. With TL designs it's even worse.. One driver doing double duty.. the back wave is slower.
As far as ports, I haven't used fixed ports in 40 years.. Passive Radiator, OB, or IB but fixed ports are Worthless..
Regards