Had the a4 for about a year now. Pretty un-eventful. Last weekend I was hoovering it for the 1st time and started poking about in the wee cubby hole on the left hand side of the boot. To my amazement the big black plastic thing that was behind the cover had a nokia sticker on it. After cracking on the radio and giving it a feel it appears to be vibrating. Cashback! Standard stereo in the car sounds pretty good to me (apart from a crackly volume pot), do these subs run from a pre-out on the headunit? Pretty happy about that little discovery That is all!