Hi guys, I got a GZ Radioactive 38 subwoofer (300 watts RMS) and a GZRA2200X (also 300 watts RMS) turned on by a salesman. I put it all nicely into my Audi A4 Limosine. I bought a Sony MP3 player as a radio, but that doesn’t matter about my problem… I should perhaps mention that I only hear Techno (hard trance / hard style), that’s what I told the salesman. So much for the history! My next problem is now, when I make louder then the bass totally swallows, and will not really play clean, the whole car (mainly the boot) is only buzzing like wild and somehow I also think that the pressure is far too little for a 38cm subwoofer with 300 watts! Since I actually have zero experience in points Car Hi-Fi, of course I don’t know what to start with the adjustment screws at the power stage, I have to have Or is the power amplifier too weak? Or do I need a capacitor? Or should I also install a new front-system? Thanks for your help!