Yup - I have built a set of speakers using fullrange drivers (Fostex) - in a mass loaded transmission line enclosure.
Fullrange means no crossover needed - correct.
There are various parameters (Thiele Small) that dictate what type of enclosure best suits a particular driver - Qts and Fs in particular.
This looks like a good place to start: https://www.diyaudio.com/forums/full-range/287246-tangband-w8-2145-a.html
There are also various calculators available that you plug the TS specs into and adjust enclosure volume etc and it will predict that frequency response.