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I had a professional install the Pioneer Tweeters specifically made for the X1 and other Bimmers. The cover and door trim were removed and wiring was used. They come with a cross-over. I put in the new SUB in the trunk / hatch, it's a special one that is low profile and advanced design flat box with legs on all 4 corners so that the down firing sub can spread the sound from the bottom sides. Also I installed a power amp and active cross-over / eq. This freed up the subs located under the seats to act more like large mids. It is not worth changing the small 3" speakers. You won't hear a difference on the HiFi system and HK or others so leave them there. Bass uses the most power of a power amp so now with the second amp for bass really cleaned up the sound and made the system so much better. I will try and post pictures of the set up soon. The bottom firing sub has enclosure has a quick connector so that you can disconnect it if you need the space.
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