... shelf speakertype:2-way,3 unit. wall shelf speaker,conference room speakersspeaker unit:Tweeter3"X2+bass10"frequency(Hz ... needing attentionThis kind of speaker system can also be installed through some accessories on the ceiling or wall.1 ... long as it installed in the speaker at the top of the box on the panel can reach to ... paint thinner, gasoline or benzene, etc. meeting room speaker hang on the wall