About: http://webisa.webdatacommons.org/432025676

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	In one implementation, crossover frequency lf is 80 Hz and crossover frequencies hf1 and hf2 are less than 300 Hz, for example 200 Hz.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com