I'm looking to install a powered subwoofer to my 2016 Canyon Crew Cab, Non-Bose system. It's a simple 8" bazooka-type sub, which I had in my old truck. I've been goin through most of the relevant threads, and I have a few questions. 1) I'd like to use the high level input for audio signal, and tap into the Front door speakers. Can I splice into the speaker line and still maintain the signal to the existing door speakers? I won't be removing the head unit or dash, but probably goin through kick panel and installing terminal blocks to split the speaker outputs. 2) What's the simplest way to wire in remote wire to turn sub on when I turn the key on?