[Radioactive]

I was hoping to do some tweaks to the underseat woofers to determine whether I could improve the sound output. Thought I’d post for any other OP’s thinking of doing the same or could use the information gained for other woofer/subwoofer installs.

Almost all the pictures I have seen on the internet for other BMW’s have shown the woofer driver mounted in a small box and then the box is connected through a circular vent to an hollow area under the car. I was going to try Acousta-stuf and resonance control via a product such as Dynamat on the box. I pulled the woofer assembly out, to find as pictured below, that the driver is mounted to a ~.5 inch thick and ~2.5 inch deep plastic circular mount. The mount is directly bolt over a 4-5 inch circular vent to a large hollow area. Not any room for tweaking here.

Information gained:
Seat bolts #50 Star
Speaker cover screws T-20
Housing mounting bolts 10mm
Rear housing bolts, a bit tough with the carpet/insulation
After thought-The right side wires were blue with stripes(probably correspond to amp out wires) . If I remember correctly; red and white stripes.
Good news-The US Premium System speaker seems to be pretty good quality.

[KingX]

Originally Posted by Radioactive

Good news-The US Premium System speaker seems to be pretty good quality.

It sure does sound good compared to the standard system and even to other brands of vehicles. Thanks for sharing your findings also