I have an isobaric case to build because my Woofer has an impedance of Eminence 8Ohm.I would like to build 2 with one case in each case but then I wouldn’t have a place in the car anymore because everyone would need 70L. What do I have to take into account and how do I have to build the case.I only know that the two have to be screwed on each other with the membrane.The more confused one side recommended to me but I don’t get through it as it is English.If it were possible, pictures wouldn’t be sc Have now 70L bass reflex with 10 tube with 15cm length.Would I be happy about nice pressure and draught up to 30 or 40Hz.