Founded in 1945 by Fritz Sennheiser and a group of engineers from the University of Hannover, the company began in the small village of Wennebostel in northern Germany under the name Laboratorium Wennebostel (Labor W). After early work on precision measurement instruments, the company pivoted to microphone development — building broadcast-grade mics through the late 1940s and setting the trajectory for what would become one of the most recognized names in professional audio.

Sennheiser's catalog spans microphones, headphones, wireless systems, and in-ear monitors across professional and consumer segments. The MD 421 dynamic microphone, introduced in 1960, became a studio and live sound staple and remains in production. The HD 414, launched in 1968, was the world's first open-back headphone and holds the record as the bestselling full-size headphone of all time. The Orpheus electrostatic headphone system, introduced in 1991, earned a reputation as a pinnacle of high-end audio reproduction. The HD 25, a closed-back on-ear model, became an industry standard in DJ booths worldwide. The evolution series of wired microphones grew into one of the most widely deployed mic ranges for live performance, covering vocal, instrument, and broadcast applications.

Sennheiser's wireless systems — including the Digital 6000 and evolution wireless G series — are used extensively on major concert tours and broadcast productions. Artists including Elton John, Sting, Snoop Dogg, Kings of Leon, Ed Sheeran, Blake Shelton, and Post Malone have performed with Sennheiser microphones and monitoring systems. In studio and broadcast contexts, Sennheiser's shotgun, lavalier, and overhead microphone lines are fixtures in film, television, and recording environments globally.

Sennheiser has 543 products cataloged on Equipboard, including Wireless Microphones, Headphones & In-Ear Monitors, and Dynamic Microphones. Their gear is featured by 1128 artists, with the strongest followings in Rock, Electronic, and Pop. Notable users include Ed Sheeran, Blake Shelton, and Ellie Goulding. Sennheiser's catalog spans the full price spectrum — from entry-level options to high-end flagships.