Steel Speaker is a minimalist design created by Portland-based designer Joey Roth. Steel Speaker is a mass-loaded transmission line that uses quarter-wave harmonics to extend the driver’s bass response. A central divider a splits the enclosure into two halves, creating a folded 24″ transmission line. The port b sits a few inches from the end of the line and the driver c sits at the middle. This positioning eliminates all harmonics other than the first, lowest harmonic, which is tuned to extend the bass response. The hardwood ball d diffuses sound from the front of the driver in all directions. It also houses the Bluetooth antenna, since it is the only part of the Steel Speaker that does not block RF.