So I have been facing this issue , I have tried real hard to ignore it but can't do it ..My HE-300 (REV 3) is having rattling issues at low frequency extensions , might have asked for a remedy 1000 times , nobody there responded so had to ask here , people were kind enough to tell me a hair could do that inside the chamber , I bought it opened her up to solve this rattling conundrum
This is the video of me disassembling it -
I don't know , this could be placebo ..I ran tracks where the rattling could not be heard , then I played some "Renaud Garcia Fons"
now for the people who know who he is then you know this is the man for the bass test , "rattle rattle rattle" that is all I can say ...
At first I thought it was only the left cup , I was terribly wrong with the help of my STX I was muting the channels to see if it was only present in one cup and there it was both cups suffered from it , now of course the hair wasn't doing it , it was the freaking poorly designed transducer by Mr , no Dr Fang
This is another video where I proved it wasn't the hair -
I really hate to bash a company , yeah sure it is an exception but all the revisions the HE-300 went through had different sonic signatures , many HiFiMAN products like the EF2A and HE-400 also went through issues .....I mean I loved the accentuated treble it had , vocals in general sounded exceptional , a good headphone destroyed because of poor assembly
Sorry HiFiMAN you just lost a customer , I can't even claim a warranty I have opened it removed the felt against the driver , probably will sell it to get a 612 pro or 880
Please don't bring in Fanboyism and ban me for this :P
This is just to caution potential customers