So I have this problem, every Sunday we have about 200 kids come over to our house in town, and they make a LOT of noise. We also have mildly nice neighbors that do not like noise Sunday afternoon when they are trying to watch a movie on their front porch. They live directly across the street, with only two vine-covered fences on either side of the road. They are getting somewhat fed up with all the noise, (imagine 100/200 kids yelling at the top of their lungs) and my dad had the idea that we build a brick wall to stop the sound. So my question is, how high would this have to be to be efficient, and is it worth the cost? (a 7ft wall would cost about $200-500) Or would it not work at all?
I previously posted this question as an acoustics physics question, it was closed for being off-topic, they suggested engineering as better, so I posted it here.