my speakers keep going in and out, the back ones dont work, how do i fix this? on 2006 Chevrolet Trailblazer

dunno whats going on please help, pretty good with my hands just need some knowledge and a little guidance, thank you

Asked by for the 2006 Chevrolet Trailblazer
sounds like a bad connection start by checking wiring and if its good try a good known speaker and see if poss the speakers are bad