Hallihallo, Have for my Fiat Brava the following “equipment” Panasonic CQ-DFX572N amplifier Emphaser EA-475 Front Sinus Live ??? rear Kappa 1 CS SUb: JBL GT102 Well, I would like to build the sub into a tube or a housing. Can someone give me some useful tips, what to consider? How to install it around, membrane inside or outside? How big should the case or tube be? How long or how thick should a corresponding reflex tube be? that at all ? For quick tips I would be very grateful to you greetings from the Saarland Andreas