I agree that sound radiates outward, But If you yell at a wall and a person is standing in front of the wall sideways so their ear is pointing towards you your yell will be louder to them than it would be to two people standing on either side of the wall because you pointed your mouth directly at the wall. So your saying 2 small mouths don't equal one big one? I have seen some bass horns and I agree they do get crazy large. My other design was modified A7 cab. see below.