When im gogin down rough roads at higher speeds I hear this wierd sound...liek a loud banging that is hard to explain..it will do it a few times really fast like bang bang bang bang....comming from the right side rear of the car. When my car rebounds it dosent bounce so Im not sure if its the struts since it only comes up and stops..any suggestions? The suspension seems soft, I have gold line coils

I would jack up the rear of the car and check the suspension out.

And the rear knuckle bushings