Hi! I am currently trying to find a good Active Noise Cancellation System for a conference room that we are currently designing. The room is 26' l x 14'-8" w x 9' h. One long wall and one short wall are made out of STC 55 gypsum board and have acoustic wall panels; the other short wall is made out of concrete; and the other long wall (26' l x 8' h) is made out of 1/4" tempered glass with silicone butt joints. We have gypsum board and acoustic ceiling panels in the ceiling. Previously, we considered using a 6" w insulating glass with a 4" air chamber to create both temperature and sound insulation. The problem with this glass is that it needs a metal structure with mullions every 4', and we really wanted a seamless look. In terms of sound, we wanted a insulation of STC 51, but since we changed to the tempered glass, it is probably bellow STC 30. So, not good... My client does not want the insulating glass, so he told me about a system or device used to cancel noise. My biggest concern is privacy: sound getting in and sound getting out. I don't know which system will work best for this project. Do you know of any company? Anything that could guide me through this? Any advice? I appreciate any help! Thanks!!!