Thanks Bill. I do plan to upgrade the speakers at the same time. So just get speakers that have a built in passive crossover. Sounds pretty simple, I didn't think most speakers came with crossovers. If the speakers have their own crossovers then it doesn't matter if the amp has a high\low filter setting does it (or do all amps come with this feature)?

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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