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I learned via tuning that if crossover/filter is not right for tweeter then they are harsh. Mylar probably difficult to get right with just passive filter.
I tried three different tweeters and they all needed their own special parameters to sound fullest/cleanest.
With a good mic can see the baseline of frequency response and get idea what can be achieved.
And in e90 some frequncies need to be lowered about -5db due to right side tweeter position (almost to the face). Depends on cone material.
Relatively easy to achieve good imaging with fully active. The feeling like driving towards the music.
In the forums i read that rear speakers are useless but damn they have quite powerful effect if blended well with the fronts.
It does slighly pull sound closer but also creates illusion like music comes equally from everywhere but artist itself is on the front.
I suppose if going passive setup then they are meh indeed.
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