Hello people This is my first post here so I now have the following problem: as already in the title it is that I get almost like no drug from my suitcase or very little (have made my K-extension myself and am despairing because it has cost me a lot of time and now my nerves are slowly suffering from it.. here are the dates car. bmw e46 323ci coupe subbox with: 2x hifonics zeus zs-12 350 w rms endstuff: Crunch v-drive v2600 powercap:hifonics 1.0 farad headunit: sony mp3 c dx-f7500 power cables are 10mm I built the box from mdf 19mm and put it on the back seats and an opening in the ski bag made with 2x 12cm diameter tubes but the box simply does not give a good bass when I make to dreoquarters of the noise dan it starts to slurp from the subs and as by the way the spotlights also flicker easily with me…… I hope very much that someone could help me because I really have no idea what I should do. gruss deju323ci