Focal Clear Mg wins on accessibility with 55 ohms impedance and 104dB sensitivity versus HD 800 S's 300 ohms and 102dB SPL. HD 800 S leads in frequency extension from 4Hz-51kHz against Clear Mg's 5Hz-28kHz. Clear Mg's 2021-03 release provides a more modern driver option over the 2016 HD 800 S at a $209 lower MSRP.