On-Stage SS7745LOK Adjustable Subwoofer Attachment Shaft with Locking Adapter (Black)The On Stage SS7745LOK Adjustable Subwoofer Attachment Shaft with Locking Adapter mounts to the top of a sub cabinet and supports a speaker with a standard pole mount socket without using a separate floor stand. The speaker pole features a stabilizing locking adapter that expands to fill the gap between the mounting pole and the speaker socket, eliminating tilt and wobble. The shaft's height adjusts to accommodate a variety of applications and locks