Sennheiser makes headphones. Spectral makes cartridges, digital components, pre-amplifiers, and amplifiers. Stax makes great electrostatic headphones. Tara Labs makes cables. Totem makes speakers.
Transfiguration makes cartridges.
Wadia makes digital components. Z-Systems makes digital equalizers and preamplifiers. Audio Magazines Ultimate Audio is a mainstream audiophile-oriented magazine. The Absolute Sound is an audiophile-oriented magazine. Stereophile is the most widely read audiophile magazine published in the United States.