Abstract: Systems and methods are provided for configuring a sound system in a confined passageway. Techniques include installing a plurality of nodes with defined identities at intervals along a confined passageway. Each node includes a microphone and two loudspeakers directed in substantially opposite directions along the confined passageway. Communication is established between each of the nodes and a control system computer. In a first set of steps that is repeated, relative positions of all nodes communicating with the control system computer may be determined. In a second set of steps that is repeated, a distance may be computed for each pair of adjacent nodes of the plurality of nodes. The technique may then include storing the relative positions of all nodes and the computed distance between all adjacent nodes in the control system computer.

Abstract: A bracket assembly includes a first body and a second body. The first body includes one or more first retainers and the second body includes one or more second retainers. The retainers are shaped and arranged for mating engagement by relative movement of one or both of the first and second body. Interaction between the retainers causes the first and second bodies to become interlocked and forced towards one another. The first retainers can include first and second lug pairs and the second retainers can include first and second wedge portions.