1.flat wall speaker,wall shelf speaker 2.The fine work quite reach the designated position 3.To ensure treble and ... shelf speakertype:2-way,3 unit. wall shelf speaker,conference room speakersspeaker unit:Tweeter3"X2+bass10"frequency(Hz): 55-20KHzimpedance(ohms ... , such as: alcohol, paint thinner, gasoline or benzene, etc. meeting room speaker hang on the wall