K&K Sound is an acoustic instrument amplification company founded in 1984 by Dieter and Karla Kaudel in Würzburg, Germany. The company relocated to Coos Bay on the Oregon coast in 1995, where its pickups, microphones, preamps, and combination systems are still manufactured by hand. Its origin story traces to Dieter Kaudel's need to amplify a vibraphone he had purchased in 1983; the magnetic pickup system he designed for it became the basis of the company's first commercial products.

K&K specializes in transducer-based pickups for acoustic stringed instruments, with product lines covering acoustic guitar, classical and 12-string guitar, acoustic bass, banjo, mandolin, ukulele, violin, and percussion instruments such as vibraphone, marimba, and drums. The brand is best known for the Pure Pickup, a bridge-plate transducer system for acoustic guitar, and its compact Pure Mini variant, which has become a widely used passive pickup among fingerstyle and singer-songwriter players. Other notable products include the FanTaStick undersaddle pickup, the Trinity microphone-and-pickup combo, and the Big Shot and Pure XLR preamps.

The company's reputation centers on passive, battery-free transducer designs aimed at preserving an instrument's natural tone, and it has built a following among acoustic players who prefer pickup systems that avoid the quack often associated with piezo undersaddle designs. Founder Dieter Kaudel previously played vibraphone and guitar in the German fusion-rock band Munju.

K&K has 7 products cataloged on Equipboard, including Acoustic Guitar Pickups, Bass Guitar Pickups, and Preamps. Their gear is featured by 6 artists, with the strongest followings in Folk, World, & Country, Rock, and Pop. Notable users include Billy Strings, Fabian Holland, and Bill Nershi.