Class makes electronics. Clearaudio makes cartridges, turntables, tonearms, and phono preamplifiers. Dunlavy Audio makes speakers. DVDO makes video scalers marketed by Princeton and Seleco. Dynaudio makes speakers.
Tech makes power conditioners.
Escient makes CD and DVD changer with a video user interface. Grado makes headphones and cartridges. Graham Engineering makes tonearms. Hovland makes electronics and cables. Kharma makes speakers.