The Mb300 horizontal array kit must be used in conjunction with the Mb200 installation kit. Consists of two connector brackets (one top, one bottom) plus the hardware required to join these brackets to the U-brackets from two Mb200 installation kits. This combination of one Mb300 horizontal array kit plus two Mb200 installation kits forms a solid frame suitable for suspending two Sx/Sb-series loudspeakers in a horizontal array. Holes are provided in the Mb300 brackets for attaching cables for suspension.