i have a 2009 nissan altima, it doesn't have bose speakers, they are the stock speakers. i put it two 12" kicker cvr's with a kicker 2X750.1 amp (it's a 750 watt amp) . i have the sub getting the audio input from splicing them into the rear speakers, i did that so i didnt have to take out the stereo. i cant seem to find a good place to plug the turn on wire in to, and when i do get the subs working, they dont sound very strong almost like theyre not getting enough power, and when i turn up the music past about 10 the car speakers make a loud pop and stop working for a second, then i turn it back down and they work again, with the subs still barely working. can anyone help me please?

I'm assuming the amp has speaker level inputs correct? The turn on wire just needs a 12v source that's switchable (ideally from something that turns on with the radio, but you can wire in a manual switch too). Also, check your main power and ground cables, for a 750 watt amp, 4 awg cables should be used here.