About: http://webisa.webdatacommons.org/168175430

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	Since the air inside the drum moves mostly forwards and backwards, the effect of the ported shell is minimal compared to the effect of a ported resonant head.
http://www.w3.org/ns/prov#wasQuotedFrom	drummerworld.com