The LR1K sonic cannon, also known as the Geonosian sonic cannon or the Geonosian defense platform, was a high-powered artillery emplacement weapon produced by the Gordarl Weaponsmiths on Geonosis prior to the Clone Wars.
The LR1K cannon used sonic blaster technology that employed internal oscillators to produce a devastating sonic blast. The high impact concussive sonic energy was stabilized by a containment sphere within the cannon until impact against a target, at which point it broke up to create an omnidirectional blast. Commonly, the LR1K required two Geonosian or battle droid gunners to operate, although the cannon's advanced, highly-precise targeting computers were capable of doing most of the work. A critical hit with this weapon would instantly kill any average clone.
The cannon had a range of 20 meters[2] and cost 9,000.[1]