Avant subwoofer location?

[dfost24]

Sounds to me like you have the base European system. Hi-low converter should work just fine by tapping into your rear speaker wires. Since the sub will only output the low level signal, distortion will be unnoticeable to the human ear (some may disagree...). I did this on my B5 that didn't have a built-in sub and it worked like a charm.

[Graks]

Seems i have the base level audi system yes. Will get an Hi-Low converter and tap into the rear speakers. Have found two types of converters, passive and a active type. Guess the aactive one gives better voltage output... Cant seem to find anyone who has done this on a B8.