Assertion: passive subwoofer | /r/HasProperty | powered by external amplifier
Facets:
Source sentences:
text: Passive subwoofers have a subwoofer driver and enclosure and they are powered by an external amplifier.
text: Passive subwoofers are called "passive" because they need to be powered by an external amplifier, in the same fashion as traditional loudspeakers.
text: Passive subwoofers have a subwoofer driver and enclosure and they are powered by an external amplifier.