Assertion: speaker's amplifier | /r/HasProperty | built
Facets:
Source sentences:
text: If the amplifiers are built in, then there will be slots for the left and the right.
text: Each speaker contains two built-in amplifiers — one for the woofer, one for the concentric tweeter — that combine for up to 230 watts per channel.
text: If no amplifier is built in, youll have to connect a separate amp.