However, don't go overboard on this by facing the computers away from each other, - because this will cut off what the teachers can see on the two or three computers they are sitting down and working with. You don't want to solve one problem and create another. Read on for more specifics. You are not out to eliminate sound. That's impossible and unnecessary.
Kids can learn in sound-filled environments, they do it everyday at school.
The mind can tune out background noise. The mind, however, doesn't do well with clashing, distracting sounds. For example, kids can tune out the computer next to them if that other computer is five feet away and the speakers are angled away. But if the other computer's speakers are right next to theirs, their brains can't easily distinguish between sounds. You want to 'dampen' other sounds in the room to allow students to stay focused on 'their' sound.