Guys, what's this?

Hello friends, I bought my car 2 months ago, the rear speakers were not working (there was an amplifier before calf ..) I said let me see that I came across it .. the same is on the other side .. I also connected and checked the loudspeaker at the same time, it worked sizzling and exploded .. Does anyone know what happened?

That material is crossower, so the sound separator sends mid-treble, mid-treble, treble, if it is nothing without an amphitheater, you can disassemble it.