E-P-W-16-4 Active Emitter 4-Pack inc 4x 16ft Plenum Cables WhiteQt Active Emitters are wide dispersion (nearly 180 degrees) direct field loudspeakers with 1. 25 (3. 17 cm) drivers capable of simultaneous reproduction of both sound masking and clear audio sources such as paging signals. Patented directfield technology ensures both uniform, comfortable sound masking as well as clear, articulate paging in a loudspeaker thats virtually invisible once deployed in finished or open structure ceilings. The Qt Active