I work in a large office. We have approx. 12 foot high ceilings. Our walls are all 8 ft high. The problem we have is that it is very echoe-y (sp?) in here and we can all hear each others phone conversations. We need to keep things as open as possible because the building is heated by two large heaters, one in the front and one in the back and we need the air to circulate through the building. Does anyone have any ideas on ways we can soundproof things around here so we're not all listening to one anothers conversations???? Thanks!