Not a JBL home audio system. But I know there's a lot of tech guys here. I'm needed help figuring out how to amp a signal coming from a stock car audio deck going to a stock subwoofer with dual voice coil. I'm trying to bypass the stock unit and use the signal to power an external sub with amp. I tried to see the two pair as a simple R/L audio signal and feed it into the amp as channel 1&2 but it didn't work well. It seems I need to wire them in series or parallel into 1 channel. I've watched videos on how to power a dual voice cool sub. But I'm needing to go reverse and use a dual vc signal to power an amp. How do I wire the pairs ing into one channel. Series or parallel? Thanks!