For standard Stereo: A tweeter and mid-range in each front door (4), A mid-range in each rear door (2), and a sub under each front seat (2). 8 speakers total.

Premium sound gets upgraded speakers and amplifiers plus a tweeter in each rear door for a total of 10 speakers.

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'05 X3 3.0i Alpine White/Gray Leather/Alum. Trim
Sport/Steptronic/Servotronic/Panoramic
Prem. Sound/Staggered 18" Style 114 Y-Spokes