I have an MTX Audio JH404 that I purchased on ebay 2-3 years ago.
I recently got another car so I decided to put my amp in the new car along with a new head unit that has apple car play.
I installed the amp and connected just the front input so I could try my phone through the radio and noticed I'm getting sound output on both front and rear channels, I'm not an expert on car audio but it seems to me that would defeat the ability of any front to rear balance and the purpose of having 2 sets of audio inputs lol.
Does anyone know what might be causing this problem?