The headband on my 2-year-old 400se was flaking, and since I wasn’t using it anyway due to the headband being a torture device, I decided to mod it lol.
I removed the old headband (irreversible) and ziptied hd600 nuggets on the metal band. The hd600 headband fits like a glove (same width as the 400se metal band). It looks kinda funny but it’s better than not being used lol.
It works surprisingly well, but I might try other headbands later on since this aliexpress hd600 headband is also pretty stiff.
The sound quality is top tier for its price. This is probably the best sounding headphones for around 100 usd, but it needs an amp.
Aside from the comfort issue, theres the usual hifiman QC roulette lol. You might get one with a broken driver. Although it’s rare, it’s best to purchase from a seller with a good return policy just to be sure.