Axel has made a name for himself in the headphone industry and set new sound standards. He has invented a whole range of headphones that now have cult status. He works as a consultant for well-known audio brands and several start-ups. The grell brand was founded in 2020. The idea behind it: Now we make our own headphones. grell is now a family business. The team pursues and lives the "mission of perfect sound". Everyone works closely together and can draw on many years of experience in their respective professional fields.