Door Speaker Recommendations?

I have a 2002 575M. My passenger door speaker is buzzing whenever a song with strong bass tones is playing. My mechanic says the Ferrari speakers are "lousy" (he was actually not as complimentary as that!) and that everyone replaces them.

I'd like to get some decent speakers but am unsure as to how to start the discussion with a speaker manufacturer. I've just started to look on the web to see if the top manufacturers list a speaker for the car and I haven't had any luck. I'm concerned about getting the right diameter, having enough clearance for the mechanisms inside the door and ensuring power compatibility.

Any and all advice is welcome - Happy New Year!