3B Scientific U8432680 Horn Loudspeaker. Safe operation of the equipment is guaranteed as long as it is used as specified. Safety can-not, however, be assured if the lead or the rods are not used correctly or are treated without due care. If it is suspected that the equipment can no longer be operated safely e. When there is visible damage, the equipment must be taken out of use immediately.Use this equipment in dry rooms only. This horn loudspeaker can be used to approximate a point source of sound and is better suited for acoustic experiments than large conventional box loudspeakers. For excitation of a Kundt tube, the outlet of the speaker can be directly placed at the end of the tube. 1 Function generator FG 100.