I work for an electronics recycler and test equipment that comes through to see if its upcycle worthy. I'm a general electronics nerd but don't know much about audio equipment. I ran across these a few months ago and love them. But I tried looking for some for myself and realized I don't know what they actually called.
Offtopic, but thanks for the work you do. I was at a ewaste place last night looking for parts to upcycle some computer equipment & a printer currently on my workbench.