help!!!!
I have a 2004 X5 with standard radio no nav. After reading the "How to add a subwoofer amp to the X5 factory audio", I decided to add a JL audio
250/1 amp and a 10w3v2d4 sub to boost the low bass. I follow the setup procedure from JL audo: configure the sub coils in parallel to achieve 2ohms and adjust the amp to 22.4 volt ac. After doing all that, I can not hear any difference. When I play with the input sensitivity, I have huge bass but the sound is awful. Can somebody tell me what I am doing wrong?