>3) Pink Noise. I worked in an office where they put speakers in the ceiling to radiate such noise. It was odd because no notice was given and it just happene

>3) Pink Noise. I worked in an office where they put speakers in the ceiling to radiate such noise. It was odd because no notice was given and it just happened. For the first week or two, we all thought it was airflow noise from the HVAC system until we noticed speakers in the ceiling. It was effective, though. It did reduce the apparent noise, though our 15 person office wasn't terribly loud to begin with. An interesting side effect was that conversations, when they did occur, got louder because the noise made low volume conversations difficult to hear.