There are some kick and snare/snare room samples that he and his engineer Jef lean on that have been passed around. One is called "CLA Kick" and one is called "TLA Snare." I was handed these samples by a reputable engineer I worked with, and they work in damn near every mix. Before Jef started working with Elvis full time, he would periodically mix out of our room, and he was a large proponent of room samples and properly selected snare samples (all of which he would make sure were aligned sample-accurate to the natural drum). On top of that, a heavy reliance on a great Neve console, a lot of saturation on the direct mics and a ton of compression on the kick.