Most likely because of my tuning skills... LOL. I have a hard time getting the 12" in tune and normally don' use it but I was trying again and that's why it's there. I have new heads ordered so we'll try it again.Why isn't it a great kit? It should sound pretty good if the shells are North American Maple and Mahogany. Maybe it's the bearing edges, warped hoops, or the shell is out of round?