Can anyone confirm that the subwoofer output on the China unit works as intended? I'm assuming it will have a flat frequency response and not be subject to the funky EQ the amplified signal receives Is there a separate adjustment in the audio menu for just the subwoofer?
I'd really like to add a sub while keeping the stock look and not having to resort to a LOC/audio processor. Thanks.
Edit: And what about the CAN bus business? This is for a 13 wrx.