hello guys. have in my leon a rear mounting. look at the picture how. to the devices jvc kdavx 1 zealum cable 5 compartment shielded 4channel emphasizer ea480 mono block ea 1350d bass emphasizer extreme t4 (60 litter gross volume, net 55 liters at 280 mm tube with 100 diameter, insulated) 2 a fiberd capacitors parralel systems original seat (I find the very good sound) to the problem. I have a phase difference between the systems and the bass. now I don’t come with it is possible from 0 -180 degrees. ES BRINGT NIX. was already at acr in bielefeld (perfect young) and they are standing in front of a puzzle, since nothing shows an effect. neither polarized nor anything else.. everything measured whether plus on plus and so on. they themselves had before a few weeks a similar expansion which played perfectly also with the same bass. the expansion is made with stick plate, only the wooferbox is made of 18mm mdf and additionally I have made bitumen under the wooferplatte. but it brings nothing. I’m slowly going crazy. you always have this stupid feeling on the ears of verpolt. you know that for sure… real. I don’t know anymore… on the photo east still the aiv driver inside.. (which is new and can be purchased, thought it might be on the driver but it doesn’t. price new 250. now 100) so. now your experiences or anything.