The problem is not architects. They know. The problem is buyers, who don't want to pay for good sound management. And when public services in the US (NY subway

The problem is not architects. They know. The problem is buyers, who don't want to pay for good sound management. And when public services in the US (NY subway, say) buy from the cheapest bidder, guess what's been compromised to lower cost? The US is a hundred years behind the state of the art in sound management, just like most other public goods.