^Welcome to clear audio my friend. Very few people care about it... until they hear it. Most people really do enjoy good audio reproduction but don't care enough to prioritize it in their homes and even lower in their cars..

Speaker sensitivity is a measure of how much volume will be produced by a speaker at a power input of 1 watt and a listening distance of 1 meter. The higher the rating, the better the speaker. I don't know what the factory ratings are, but >85 is considered pretty good by mass market speaker standards.

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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)