Assertion: subwoofer | /r/HasProperty | required
Facets:
Source sentences:
text: Stereo speaker have actually no room for bass, so that’s why subwoofers are required.
text: This frequency range is good enough for most applications but for those who really want the best sound, a subwoofer is necessary.
text: When putting together a great home theater system, a subwoofer is a necessary purchase.