Unfortunately that was the largest i could get the diagram.
You can try for yourself by going here
http://www.bmw-planet.com/diagrams/r.../e87/index.htm it might render better on your computer.
It is a java applet that renders the wiring diagrams dynamically on your screen (they aren't pre-made images is what i'm trying to say)
What are you trying to do? Might be help you another way?
The connectors are laid out such that +ve and -ve for a chosen speaker channel are directly above/under each other:
______________________________________
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9|10|
11|12|13|14|15|16|17|18|19|20|
______________________________________|
So for e.g. Pins 6 & 16 to go the right subwoofer where pin 6 is +ve and 16 is -ve.