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yes,it mean not much all messy like this.open mind and creative idea and some patient,but also critic and new approach will give a constructive dimension...Thermo,pressure play a huge role as the boundary,LIMITED expansion. all the formula are their we just grab are need and fit to this BOX.I know 2 way but sure more will appear .......I design this cheap...for me a good surround sound. will do the job..I will do my best as clear as possible.the box=sound,expansion=thermo,atom.............philippe martin....I am crazy but I trust my math.