Assertion: monitor speaker | /r/HasProperty | ported closed-back
Facets:
value: without a vent
type: OTHER
value: without passive radiator
type: OTHER
Source sentences:
text: While most studio monitor speakers are either ported bass reflex designs, or closed-back without a vent or passive radiator, Mackie's HR824 and HR624 monitor speakers have a passive radiator installed on the rear of the cabinet.