https://en.wikipedia.org/wiki/Accuphase
https://en.wikipedia.org/wiki/Denon
https://en.wikipedia.org/wiki/Kenwood_Corporation
https://en.wikipedia.org/wiki/Sansui_Electric
https://en.wikipedia.org/wiki/Boss_Corporation
https://en.wikipedia.org/wiki/Technics_(brand)
https://en.wikipedia.org/wiki/Luxman
https://en.wikipedia.org/wiki/McIntosh_Laboratory
