Eliminating Pub Noise

This pub was plagued with complaints from a single source for years. Strangely that source was 50M away and several floors above, in a busy city centre. IA identified the most significant sound path. A ‘leaky’ set of doors. A custom engraved glass sound stopping barrier was installed. To the eye there  is nothing to see  but an elegant glass door window.  However the problem is gone.