Sennheiser HD 550

The Sennheiser HD 550 is a high-fidelity audiophile headphone part of the renowned HD 500 series. Originally a German family-founded brand, Sennheiser evolved from a microphone manufacturer into a global leader in professional and consumer audio. The HD 550 specifically utilizes 150-ohm transducers manufactured at Sennheiser's dedicated facility in Ireland, while the product assembly and historical engineering roots remain tied to Germany and broader supply chains in Romania and China.

In 2022, a major organizational shift occurred when the Swiss-based Sonova Group acquired Sennheiser’s Consumer Electronics division. While the professional audio division (microphones and stage equipment) remains with the Sennheiser family, the headphones and consumer earbuds are now owned and operated by Sonova under a permanent brand license. This transition has consolidated the brand under one of the world's leading providers of hearing care solutions, blending traditional German audio engineering with Swiss medical-grade acoustic expertise.