Finally, I'm fed up with solving how to get streaming audio to this system, as the BMW Combox A2DP can't seem to get to the Professional HU - at least I've found no one that knows how to program this (if it is possible).
The car now having returned to my place from 3DM Motorsport, I decided to go ahead and install two subwoofers to finish off the sound system. I chose Alpine PWE-S8 subs. These are 8" sealed boxes which include a 120W RMS amp. Compact in size, I can install them laterally on the rear bulkhead by the floor. With the seats in their regular position, these units will be invisible.
I've been trying to keep the complete stereo install stealth, fully integrated with BMW factory harness wiring, with nothing externally visible. To wire in the subs, I decided to tie in to the rear power distribution block. I had one slot that was both free and had a powered spade installed. Ironically realoem does not show the connector and socket available, but they are identically to the E90 - lo and behold I could find those part numbers. I decided to run 10 gauge wire, which would support 240W RMS.
|Forgestar F14 wheels||19x9 ET35 & 19x10 ET38, Bronze Burst finish, red caps, TPS|
|Hankook Evo v12||245/35-19 275/30-19|