From the manufacturer Monoprice Satellite Speaker Floor Stand Description : Many small satellite speakers have ports on the back, which are designed to improve the bass response. For best sound response, it is usually recommended to mount these speakers about 1-2 feet away from the wall, to allow the ports to work properly.This speaker floor stand set is designed to let you mount your satellite speakers in an ideal location, away from a wall. The stands are height adjustable from about 26.8″ to 43.3″, allowing you to mount the speakers at your ear height when sitting. They can hold speakers weighing up to 5 lbs each.The brackets mount onto speakers with a standard 1/4″ x 20 mounting screw or via a keyhole mount. The stand tubes are hollow so that the speaker wires can be hidden within.