I am on my second case because on the first case t he little mesh on the top that protects the rubber membrane came off, and otterbox didn't blink, they sent me a new case. So on this case I put a ring of superglue around the edge of the front and rear speaker meshes, and I haven't had any problems with it yet!
This is a good case, I don't use it in the shower, or wash it or anything like that, but it provides peace of mind. After I added the superglue, I think this case is really rock solid, I've dropped it lots, and gotten it wet, and my phone is still in pristine condition. One of the reasons I picked this over a Lifeproof is that the headphone and usb seals are connected and I can't lost them.