Hello, on recommendation from fluxwildly76 in another thread (http://www.motor-talk.de/showthread.php?…) I bought two Rockford Fosgate P112S4 Subwoofer. Thank you for the help and hope you can read with me and of course all the others. Now on the topic: I drive an E36 Coupe, no ski bag only foldable back seat. For the Subs I have to build a housing and I need help with the calculation etc. so that the Rockford 1. I’m not quite sure in which direction I should align the subs, whether to the passenger cell or the rear? 2. Should the box be divided into two chambers because of the two subs? 3 What wood is the best and how thick? Connection terminal I have to buy then. 4. Do I also need bass reflex tubes?? If so how long and how long??? I would like to build the case with a plexiglass wall in front of it so that the subs look good. mmen, maybe a few spike flow from the hardware store still with in to the peterde. How do I attach the Plexiglas best to the box? It is of course also about optical wants a small beautiful trunk expansion so to speak and of course also well Mucke, it is clear to me that not always everything can be arranged. I am grateful for any help, is really a very good forum!!