Hey everyone, I picked up a 2004 270 CDI **********e SE last week. The cars great, but I'm getting a strange rattle from the back left speaker at certain bass ranges. (I'm assuming its a sub woofer?). I've been trawling though forums all morning looking for information. I've been told these cars can come with standard MB speaker setups, BOSE or an HK system.... Is there an easy way to tell which setup I have? Also - any ideas where I might find a replacement speaker? I've already tried Ebay, but im not having much luck. Thanks in advance!!