Question Why did my rear speakers stop working right?

Jun 5, 2019
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So I just installed a new head unit in my car. It's a double-din touchscreen and I wired everything up and all the sound was good and speakers worked great. Today I took out my rear speakers. When I put them back in, and turned my car on, all the bass was GONE. They had great bass the day before but now they just sound horrible. I dont have any idea what I did so somebody for the love of God help