About: http://webisa.webdatacommons.org/296338949

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Good echo chambers were difficult and expensive to build, especially in urban locations where real estate was expensive and extensive sound isolation was needed to keep out traffic and other noises.
http://www.w3.org/ns/prov#wasQuotedFrom	studioelectronics.biz