I bet it sounds just like any other shape same sized enclosure . //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
Yeah, it looks awesome and looks like it took a lot of work...
...sadly, a sphere is the worst shape for a speaker box. I don't think it will matter too much with a subwoofer...but spheres and cubes tend to have terrible resonance, because specific frequencies get reflected multiple times inside of the enclosure.