moin youngs…. I’m expanding my case room. I’ve got a “tolle” bass roll in it so far….because I need too much space to get away and the bass should be installed with the best possible efficiency. Ask yourself now 2 questions: 1. where to build with the bass….box? spare wheel chuck? freeair (is that so?) bass reflex? without reflex? 2. how do I calculate the volume of the required space that the bass needs for optimal reproduction? and what does it do? would be nice if you could help me there bitsl! thank you gruss r.w.