phixnguyen

I know there are thousands and thousands of forms that I can look at I’ve read soo many of them and none of them seem to work what is the best way to add a aftermarket amp and change out my subwoofer in a 2018 Audi a4 premium plus with a B&O system

SMac770

Take the factory sub wires and run them into a high level input on an aftermarket amp or into a high to low converter.

bruce_miranda

You need an amp or LOC that is capable of taking in a 40V high level input. The rest is straightforward.

Bobby Kinstle

The easiest way is to use a Kicker KEY500.1 and connect both coils to the R and L high level inputs (kicker recommends always connecting both).