Does anyone know the speaker sizes for an 02 330i. I know there are 2 on the front doors not including the tweeters near the window, one on the back doors and two "subs" on the back deck. The back deck speakers appear to be 6x9 or 5x7; I've never seen a sub in those sizes. I'm considering changing out the stock HK speakers with some 2 or 3 way replacements with the hope of increasing the frequency response in the HK system. I'm very disappointed with the sound of the HK system.