Hey guys im new to the site and i have a 2007 chevy silverado classic. The question i have is i want to install 2 12" subs and an amp in my truck, and i dont want to change the stock HU. i was talking to a guy about doing it and he said i may need a "line out invertor" to hook them up to the stock HU. Just wondering so i didnt have to get it all apart and then figure out i need one. Thanks.