Has anyone figured out the Amplifier Level Setting to their stock TC radio. I'm thinking that Amplifier Level Setting are the same for all amps since it all depends on the radio right? I hooking up an amp with two subwoofers in my trunk. Im going to use a line converter to get rca out's straight from my rear speakers so that I dont have to take out the radio. But my amp has knobs for setting up gain levels, lows etc. Im need to know how much should I set the gain and lows level on the amp so that it would match the radio's gain output. So that the amp's gain level will equal the radios. Just for reference, its a Hifonics BX1500D amp and two 12" Eclipse Ti 9122's. Thank very much for your help. I am really sorry if im getting on peoples nerves by asking similar questions that I maybe should know the answers to, but I really want to make sure I get this done perfect for the first time.