By the way, I plan on purchasing these speakers from BSW. I have read plenty of threads here on them. The problem with most threads is posters say things like "the upgrade is much better than OEM!" or "this sounds really good!". The problem here is that these terms are not very descriptive. You have to keep digging and reading to find out how they actually sound. If you do, you will find that many here say it makes the music sound "brighter". Which I interpret to mean it boosts highs and vocals. I am not concerned about this because I do have the subwoofer system (which I plan to upgrade as well with the JL Audio subwoofer).

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[Sold] 2004 X5 4.4i - Sterling Gray - Truffle Brown, Sport, Preminum, Rear Climate, DSP, Sirius, PDC, 132's (19 inch wheel), Comfort Seats
Dynavin, JL Audio Stealthbox, Alpine PDX-5 Amp