Assertion: subwoofer's amplifier | /r/HasProperty | necessary
Facets:
value: to use this protected subwoofer
type: PURPOSE
Source sentences:
text: Enclosed powered - No additional amplifier is necessary to use this protected subwoofer as it has internal amplification.
text: Amplifiers are always going to be needed when you add a subwoofer.
text: No additional amplifier is necessary to use this protected subwoofer as it has internal amplification.