Assertion: headphone's quality | /r/HasProperty | mediocre
Facets:
Source sentences:
text: Initially the audio quality was mediocre and a step forward was the invention of high fidelity headphones.
text: Like earbuds, most headphones are of low or mediocre quality and do not transmit the bass efficiently.
text: Initially the audio quality was mediocre and a step forward was the invention of high fidelity headphones.