So I've got an 05 Gmc Envoy SLT with factory Bose system. I'm looking to add a new powerful subwoofer, amp, and head unit while keeping the stock bose amp, door and dash speakers. My question is how if possible do I power the new components while letting the bose amplifier power the door speakers as it is. I want an upgraded head unit to control the whole system. Essentially new HU sending signal to bose amp for door and dash speakers, while also sending signal to new amplifier dedicated to just the main sub or subs. I just have no knowledge as to what the factory specs are for bose amp and door speakers are, like what the factory speakers require for wattage, how much the head unit needs to put out to handle all the components or really any electrical related tech. Any help is much appreciated.
