Has anyone done a simple door speaker replacement? Just enough to improve the sound without going crazy with the stereo system? I have the Business CD, non-DSP system. I just installed an OEM 6 CD changer (ebay purchase) in the trunk last night. So now I'm running 7 CD's (which I'm finding very convenient) through the very THIN sounding speaker system.
Any recommendations on speakers? Perhaps changing the door speakers won't make a noticable enough improvement?
Thank you.

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2002 X5 4.4i | Black Sapphire Metallic | Premium Pkg | Sport Pkg | Tow Pkg | Xenon | Sliding Load Floor.