Sennheiser HD 660 S vs. Beyerdynamic DT 990 Pro

The Sennheiser HD 660 S and the Beyerdynamic DT 990 Pro are two highly regarded open-back headphones that are popular among both audiophiles and professionals alike. Both headphones offer excellent sound quality, but there are some key differences between the two that may make one a better choice for you than the other. Sound quality