Assertion: digital piano | /r/HasProperty | connected to a power amplifier
Facets:
value: to produce sound
type: PURPOSE
Source sentences:
text: They also must be connected to a power amplifier and speaker to produce sound (however, most digital pianos have a built-in amp and speaker).
text: They also must be connected to a power amplifier and speaker to produce sound (however, most digital pianos have a built-in amp and speaker).