Lived in Charlotte for close to 30 years, great city. I'm curious as to what this LC2i device is you're talking about, and how I'd go about getting one installed? Just took delivery of my M3 2 weeks ago, and while the premium sound system sounds great, the sub in the trunk is barely even audible, looking for a quick way to boost it until I can figure out a more audiophile-oriented solution. Open the trunk, and it's fairly decent sounding when you stick your head in. Close the trunk, it may as well not even exist inside the cabin in the front seats. From what I've read about the device you mentioned, seems like it'll at least boost it enough to somewhat hear inside.