Hi, im trying to hook up my subs to my appradio but vant seem to get them to work :/ says something about not wiring the rear speakers up if using subs but just not 100% on this?! Have everything hooked up like I did with my old stereo, but now with the appradio my amp goes into protection mode can someone please help me out?! Thank you so much!

I'm having the same problem.  I had an adapter spliced into the rear speakers which didn't work on any setting and tried to plug it in with the RCA plugs on the back of the radio.