Updated 2/23/20. Added HiFiMan Video Shootout. 1,188 word post, approx 2-3 min. read Let’s start with a quick chart! Comparison Chart Hey there friend, and Welcome aboard!! Before we get into the Oppo PM3 vs. HIFIMAN HE400i Comparison, grab a snack, sit back and relax because.. You’ve come to the right place!! What I will