This design won’t change anything compared to other speakers for bass. Below 150-200Hz sound propagation is anyway omnidirectional for all speakers. For mid/treble: the spheric baffle and enclosure is a classic, not much different in reality with a well designed closed box design of comparable size.
With these dimensions your first modes will be approx. 40Hz, 48Hz, 80Hz, 96Hz (not counting the first ceiling/floor mode typically around 70Hz in a standard 2.5m high room). For a hifi-system, it is important to have signal at least down to 35Hz. Anyway you will have to cope with the full-length 80Hz and 96Hz modes which wille be both very pronounced and in an area where music has a lot of energy - bass lines typically.