The Gauss Speaker Company, later known as Cetec Gauss, was a Sun Valley loudspeaker company. They were approved by Fender Musical Instruments Corporation and found widespread use among rock musicians of the 1960s through the 1990s<sup>[cite?]</sup>. The company is notable for its technical improvements in , which include the use of two spiders at once. The former factory of Cetec Gauss was taken over by SWR Sound Corporation in January 1999.