Mike Metra

Old topic but on my 03 Acura Tl you have to bypass the stock Bose eq. FYI The stock HU has 3 line-level audio signals going to the EQ (left, right, and sum, plus one common) and two return lines (left and right, plus one common). The "sum" output is EQ'd then sent directly to the subwoofer amp behind the rear seat.