^ What he said.

For the price you'd pay... much better off buying other aftermarket gear. I removed a full set, sold the amp/sub. I'm keeping all the interior drivers for a future upgrade on a car I want period correct (I believe MB Quart made the drivers at the time for Bavsound/BSW), but would not power them with the factory amp. The factory gear (even DSP amp) just isn't capable of quality audio. Not enough adjustability. Which is too bad... because it is a true 12 channel amp.

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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)