The HD800S and HD660S2 are Sennheiser’s two top open-back headphones at the moment. The HD800S was launched in 2016 and is the revised version of the HD800, launched in 2009. The HD800 had a completely new design and drivers, created from scratch aiming to be the best dynamic headphone in the world.  The HD660S2 has a longer heritage. Starting with … Continue reading SENNHEISER HD660S2 VS HD800S REVIEW