Hooking up a subwoofer to preout

Ok, I have spent WEEKS trying to find a diagram or description of how to hook up a subwoofer to my receiver’s Pre out jacks, to no avail. Can someone please walk me through this? Do you simply use a dual (red and white) rca cable from the red and white Pre out jacks on the receiver to the red and white rca inputs on the sub? 
Any help is greatly appreciated.