Hi, I have to install an installation in my recently acquired e30 318i. I just read here in the forum bitserl and came across this subwoofer -> http://www.bigdogaudio.de/…/helix-deep-blue-12-single.html . I like the price/performance ratio here very well, is that also what is clever? In addition I need a radio or headunit that supports on EVERY FALL either SD card or USB stick. Of course I would like to save money where it is possible, but not at the wrong one. I would rather spend a little more on good hardware, but the frame would be so MAX 400eur; I hope that is to be realized. I also need a power amplifier for the subwoofer (speaker I would like to use the ones already installed in my BMW, that is enough for me -> http://wurstkoenig.wu.ohost.de/bullcrap/innen/P1060130.JPG . I would then feed them directly from the radio. And to all of this I also need cables; which cross section should I take there, and n even more important, which cables do I need anyway? Another question: I noticed the subwoofer has 2 inputs, doesn’t it need only one? Because it has no stereo function or something? mfg