OK, so I have this O.C.D. thing where I tap on the shells of IEMS right after I put them in. Well, I lightly tap, then snap my fingers outside my ears so I know I have a good seal. Not too crazy, right? Anyway. I currently have in my possession a pair of SM3 v2's. When I put them in and tap on the shells, the left one makes a sound sort of like a hand drum. It's sort of a hollow sound that takes a bit of time to decay (one second maybe?). The right IEM is nice and solid sounding like every other IEM I've tried. There's a very quick tone that disappears almost instantly. Has anyone experienced this before? I'm not sure if it's affecting the sound quality or not, but I would think if there's sound resonating in the shell like that when it's tapped, then something might be up, right?