Assertion: headphone | /r/HasAspect | high impedance
Facets:
value: relatively
type: DEGREE
value: historically
type: TEMPORAL
Source sentences:
text: Historically, many headphones had relatively high impedance, often over 500 ohms so they could operate well with high-impedance tube amplifiers.
text: Historically, many headphones had relatively high impedance, often over 500 ohms so they could operate well with high-impedance tube amplifiers.