Bluetooth volume/speaker

[ShineOnX5]

Is there a way to make the bluetooth phone volume louder or use all my speakers? I think it is using only 1 speaker on the drivers side.

[UCrewX5]

Is there a way to make the bluetooth phone volume louder or use all my speakers? I think it is using only 1 speaker on the drivers side.
One way would be to splice into the wiring and insert an amp, such as the ELK800. See http://www.bimmerboard.com/forums/posts/45825 for an idea of how this would work.