Zerest Audio started when I handed a pair of handmade earphones to a friend. She loved it so much, she said "Why don't you sell earphones?" As a hobbyist, I spent many years building earphones by hand. A particularly niche hobby I'll admit. I also loved the idea of detachable cables - a concept mostly available for high end brands then. I would buy numerous kinds of speakers online. Neodymium drivers, balanced armature drivers, high pass filters and so on. I would solder ever