Assertion: speaker's driver | /r/CapableOf | use two subwoofers
Facets:
value: to back
type: TRANSITIVE-OBJECT
Source sentences:
text: A second method of rear delay array combines end-fire topology with polarity reversal, using two subwoofers positioned front to back, the drivers spaced one-quarter wavelength apart, the rear enclosure inverted in polarity and delayed by a few milliseconds for maximum cancellation on stage of the target frequency.