I bought this speaker system I bought from a guy in parking lot, did I get robbed? I'm hearing people say the model I bought retails for 2800, and is a very popular item to scam with... I opened up a corner speaker and found concrete inside it. I am hoping this is a weight to keep the item from bouncing while in use? I've got a friend saying it could be magnetic shielding or something. ... pic related. Did I get scammed?