ETC CSLDS ColorSource Linear Diffusion Spacer for 0.5-Meter Diffusers 100738316 even when the speakers are

even when the speakers are positioned right against the wall

Metal Switches

Direct Thru: Direct output to connect to recording or monitor systems

Compatibility- The UA845UWB is compatible with all Shure wireless microphone receivers operating within a compatible frequency range

With three different types of ear tips included and in three different sizes

ETC CSLDS ColorSource Linear Diffusion Spacer for 0.5-Meter Diffusers 100738316 even when the speakers areETC CSLDS ColorSource Linear Diffusion Spacer for 0. 5 Meter Diffusers For ColorSource Linear 2 and ColorSource Linear 4 fixtures only. These spacers are required when using diffusion lenses, not for louver or barn doors.