These are modular headphones in the sense that you can mix&match the drivers/headband/cable you like. I saw some DJs use these while looking through recordings from events on YouTube.
Cost (strongly depends on parts) is anywhere between 150€ to 330€ TMA-2 Configurator
I remember seeing that LTT video but nothing since. I guess they are still a thing so they probably aren’t total crap I guess. I wish zeos or someone that specializes in hifi would review these. If they actually sound good then this is a really cool idea.
