The HY-PF7B Speaker rigging frame is used exclusively to suspend the HX-7B Speaker system from the high ceiling indoors. The FB-150B or FB-150W Subwoofer system can also be suspended using the HY-PF7B and the Speaker rigging frame's supplied mounting brackets. The HY-PF7B is capable of suspending up to two HX-7B speakers and one FB-150B.