These are two dynamic driver headphones that are top-of-the-line (TOTL) headphones for their respective brands. They are, however, quite different in many aspects. First, the D9200 is closed back, and the HD800S is open. Second, the D9200 is low impedance with a very high efficiency. The HD800S is high impedance and medium efficiency. Third, they are of very different physical design, … Continue reading DENON AH-D9200 VS SENNHEISER HD800S REVIEW