About: http://webisa.webdatacommons.org/142737681

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	It is true that preamps are an interface for your amplification gear as you described but let's not confuse what a headphone amp is: it is an integrated amplifier that already has a preamp, not just an amplifier.
http://www.w3.org/ns/prov#wasQuotedFrom	head-fi.org