Car stereo weird audio problem
Hello everyone. I hope someone can help me or point me in the right direction. I just had an Alpine CDE-SXM145BT, Hifonics Amp and Subwoofers installed into my '01 Chevy Impala and I'm having a weird issue where I'm getting full sound from my car speakers when I choose the "Tuner" (radio) source but no sound from my speakers through any other source such as "AUX", "Bluetooth" or even just a reg CD. What could be the problem? The installer looked confused and didn't know how to fix the issue and said "if theres sound coming from the "Tuner" source theres no reason the other sources shouldn't work." Hmm, If there's sound coming from one source why would the other sources not work?? (I can hear bass from the subs with other sources but no audio from the reg speakers) Any help is greatly appreciated!