Record Disc

Pioneer played a role in the development of interactive cable TV, the LaserDisc player, the first automotive Compact Disc player, the first detachable face car stereo, Supertuner technology, DVD and DVD recording, the first AV receiver with Dolby Digital, plasma display (with the last 2 years of plasma models being branded as Kuro, lauded for their outstanding black levels) and Organic LED display (OLED). The company works with optical disc and display technology and software products and is also a manufacturer. BMW, Volkswagen Group and Daimler AG of Germany jointly acquired a 3% ownership stake in Pioneer through a joint venture company called Here B.V. Most of Pioneer's shares are held by Mitsubishi.

By the mid-1940s, Shure was also manufacturing and supplying phonograph cartridges to major phonograph manufacturers including Philco, RCA, Emerson, Magnavox, Admiral, and Motorola, and was the largest producer of phonograph cartridges in the U.S. at that time. Among Shure's innovations in phonograph cartridge design was Ralph Glover and Ben Bauer's "needle-tilt" principle for minimizing record wear while improving sound reproduction, and Jim Kogen's engineering concept of "trackability". Shure produced the first phonograph cartridge capable of playing both long-playing and 78 rpm records, the first cartridge with tracking force of only one gram, and the first cartridge meeting the requirements of stereo recording. At the peak of Shure's phonograph cartridge production, the company was producing approximately 28,000 cartridges per day, with 25,000 of those coming from a Shure phonograph cartridge plant in Phoenix, Arizona. After the introduction of compact discs in the 1980s reduced the demand for phonograph cartridges, Shure closed the Phoenix facility but continued manufacturing phonograph cartridges in Mexico.[2] In 2018, Shure announced that they would exit the phonograph cartridge market.

Up until the end of 2005, products in Japan were marketed under the brand name AddZest, while outside Japan the same product typically carried the Clarion name brand. This was changed in 2006, and the brand "Clarion" along with a redesigned logo are now used worldwide. It is known for its close relationship with Nissan, which uses Clarion products almost exclusively in its vehicles. Nissan once owned a 6.25% share in Clarion, although that was reduced in 2002. Clarion has an OEM relationship with many automotive companies, providing car headunits and components to them for their production vehicles. Clients include Saab Automobile, Suzuki, Ford, Volkswagen, Proton, Toyota, Subaru, and Peugeot. A contest is held annually to select the Clarion Girl, who is chosen to represent Clarion's car audio equipment in television and print advertising campaigns during the following year. The contest was started in 1975, and is now co-sponsored by Fuji TV.

In the early 1970s, Koss worked out of two locations near each other. One was Koss TV-Rental, which also did electronics and musical instrument repairs; the second was the main facility two blocks to the east. At this time, Koss pioneered the high-end "electro-static" "ES series" headphone market. These headphones set the standard for wide-range frequency response. Being very durable, they required service for wear and tear on cords and earpads during their lifespan, by K&M Electronics (Klenworth & Midwest based in Minneapolis), working out of the TV Rental location. Koss headphones were easy and cost-effective to repair. At this site, a separate garage was set up to support the musical instrument and electronics repair business. The TV rental and repair site was managed by John's brother Pete Koss. Eventually, Koss dominated the headphone market, competing mainly with Telex. Koss was considered a higher quality unit at the time, offering a wide line of models.