Today’s cars are all wired up into themselves. So much so that you can’t upgrade the head unit because it can open your garage door and shut off your home alarm. So what do you do? Get hooked up with the Massive Audio “Flatline II” a OEM line/drive converter that can take 12 separate OEM channel speaker inputs. It utilizes an auto music sensing turn on with 12V out. The systems can auto sum 2 separate 6 channel network groups for full control of F/R channels! Adjustable outputs levels (>4.8V RMS and an S/N Ratio >105dB) let the installer fine tune any OEM source/ unit into a Massive Audio Power House without losing your head!!