Make that three in the STX -> M3 club
I'm feeding through the lineout as well and I found better SQ that way tbh + that I can hook up my AD700 to the headphone out so I can use Dolby Headphone while gaming . I have to put the volume to 1 (yes 1!) for the AD700's lol. Even then it's sometimes too loud thus I have to change the game volume in game.