Updates 6/28/19. 8/18/19. Added link to updated FiiO K3 vs. E10K 9/24/19. Article/link cleanup. 3,056 word post, approx 7 min. read Hey there friend, and Welcome aboard!! Before we get into the Audioengine D1 vs. FiiO E10K vs. DragonFly Red Shootout, grab a snack, sit back and relax because.. You’ve come to the right place!!