This company was founded in 1923 under the name "Ideal". Its core business was the manufacturing of headphones. If the headphones came through quality tests, the company would give the headphones a blue dot. The quality symbol would become a trademark and the trademark would become the company name in 1938.

Blaupunkt (German for 'blue dot') was founded in 1923 as 'Ideal' in Berlin. The company's quality control involved marking headphones that passed tests with a blue dot, which became so recognized that the company adopted Blaupunkt as its official name in 1938. Shure is American, Sennheiser (not Sanheisser) is German but founded later, and Behringer is a much newer German company.