Hi guys! Anybody tried installing some kind of active noise cancellation system? My idea is to use a mic and a phase inverting amp to "inject" just the right amount of phase inverted road noise into the signal path running to the Harman Kardon amp. This would theoretically cancel out at least some of the low frequency road noise, if setup correctly. Are there any after market systems available? I´m quite used to developing analog electronics myself, so Another approach would be to find the HK amp and insert my own "gadget" in the signal path. Haven´t had the time to even find where the amp is located, but I guess someone here knows, and if it uses any standard plugs, such as RCA for example?