I found out that if i cup my hands on each side (with palms up) i get much more sound, and the sound seems louder from the backside (without my hands); my idea is to have some cup/parabolical shaped attachments to direct the sound towards the user like how i can do with my hands. This might possibly even be built with one of those homemade rapid protyping machines (might involve some trial and error to get the sound to bounce just right)