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If I was you chap , I would buy the e90 window trims so you can install the tweeters in the corners of the door, then buy a set of components , or a set of 'add on ' tweeters, this will make your front sound a lot brighter and I did this to begin and was happy with that .
Then I have added a JL audio amp , along with a pair of match underseat speakers, which is definitely a step in the right direction , I have disconnected the speakers in the rear doors , and running the underseats off two channels,and the fronts off the other two channels .
At the moment sound is vastly improved, a lot clearer,more punchy bass but need to set it up properly, will then debate wether to add an amp and a boxed sub firing through the ski hatch ,good luck, Den .
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