What do you do if you have a speaker cabinet that does not have a built-in speaker mount socket, but youd like to use it on top of a tripod speaker stand? Simply install a TSM-138MK to the bottom of the speaker cabinet, and youre set! The TSM-138MK is an internal, metal mounting bracket for speaker cabinets that do not have built-in speaker mount sockets. It mounts on the bottom of a speaker cabinet (mounting inside the speaker cabinet) with included installation hardware.