The front sound field equipment is a golden match! Probably a debugging problem! Can't bass work? Do you want to blow up the plane? The subwoofer at the back has been adjusted and connected at the front to make up for the bass problem! Dana 242 pointed to the rearview mirror? Hehe, although 1 10 has a wide range of treble sectors! But you can't point there! The car rattled on the uneven road! There must have been something left in the car when the car parts were disassembled.