PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Sound Pressure Level (SPL): 40hz - 80hz (Test tones are played rather than normal listening music, to avoid low freq., which damages the speaker.
http://www.w3.org/ns/prov#wasQuotedFrom
  • boxden.com