That’s an impossible dream, isn’t it? Not according to Sennheiser. With the HD 620S, the company has introduced a closed-back design into what has, until now, been a range of open-backed ...

Since then, Sonova AG has produced a few products under the agreement, including the Momentum True Wireless 4 earbuds and the Sennheiser HD 620S. Any doubts I may have had over the quality of the ...