Circuit Research Labs, Inc. develops, manufactures, and markets electronic audio processing, transmission encoding, and noise reduction equipment for radio, television, cable, Internet, and professional audio markets worldwide. Its products are used to control the audio quality and range of radio, television, cable, and Internet audio reception, as well as allow radio and television stations to broadcast in mono and stereo. The company sells its products through a network of wholesale distributors and dealers. Circuit Research Labs, Inc. was founded in 1974 and is headquartered in Tempe, Arizona.