Sennheiser

A brief history

Sennheiser was founded in 1945 by Fritz Sennheiser as Labor W, in the village of Wedemark near Hannover, originally building voltmeters for postwar German industry before pivoting to microphones in 1946. The MD 4 microphone, the first directional mic of the postwar German industry, was the starting point of a catalog that now spans broadcast (MKH shotgun mics, MD 421), live touring (Evolution Wireless), and studio reference (HD 600, HD 650, HD 800 S). The consumer earbud business grew through the 2000s, culminating in the Momentum line (2012 onward). In 2022, Sennheiser sold the consumer division to Swiss hearing-technology group Sonova, which now operates Sennheiser Consumer Hearing — including all Momentum, ACCENTUM, and HD 4-/5-series headphones — while the original Sennheiser electronic GmbH retains the professional broadcast, live, and high-end audiophile (HD 6-, HD 8-series) businesses.

What Sennheiser is known for

Sennheiser's professional and audiophile reputation is the brand's deepest moat. The HD 600 (1997) and HD 650 (2003) open-back headphones remain reference monitors in mastering studios worldwide; the HD 800 S sits at the top of the audiophile open-back tier alongside Focal Utopia and Audeze LCD-series. Microphone design — the MKH 416 shotgun, MD 421-II broadcast dynamic, e 906 guitar mic, EW wireless systems — covers nearly every professional production workflow.

On the consumer side under Sonova, the Momentum 4 over-ear and Momentum True Wireless 4 lead Sennheiser's wireless flagship line, with the Momentum True Wireless 4 being the first earbud to ship with aptX Lossless support over Bluetooth (Snapdragon Sound), and the Momentum 4 over-ear holding one of the longest battery lives in the category at 60 hours. ACCENTUM and HD 350BT cover the mid-tier, and the IE-series IEMs continue the wired audiophile tradition. Tonal balance across the consumer range leans neutral-to-warm with strong sub-bass extension, generally more linear than Bose or Apple but warmer than the Sony 1000X.

Where Sennheiser excels on vsMars

Sennheiser competes most directly in the headphones category, where the Momentum 4 anchors the wireless premium bracket and appears in best headphones; the HD 6-series open-back models feature in our wired and audiophile comparisons. The Momentum True Wireless 4 sits in the upper tier of wireless earbuds and best wireless earbuds, particularly on codec support and audio quality subscores against Sony WF-1000X, Apple AirPods Pro, and Bose QuietComfort Ultra Earbuds. Sennheiser does not currently field products in our smartphone, TV, monitor, or laptop categories.

Trade-offs to know

Active noise cancellation on the Momentum line is competent but trails Sony WH-1000XM6 and Bose QuietComfort Ultra, particularly below 200 Hz and on transient suppression — buyers who prioritize ANC above sound quality should still cross-shop with those brands. The Smart Control app has improved but still ships fewer features than Sony Headphones Connect (no equivalent to Speak-to-Chat, less granular ANC adjustment, fewer firmware tools). Fit and ergonomics on the Momentum True Wireless line have been a long-running complaint — the housing shape is larger than competing earbuds and seal quality varies more by ear shape than the Sony, Apple, or Bose alternatives. The Sonova ownership split means firmware support and accessory ecosystems for consumer products are now decoupled from the professional Sennheiser GmbH, which has caused confusion for buyers cross-shopping HD 6-series (pro) and HD 5-series (consumer) models. Finally, post-warranty service economics for the open-back HD 800 S and higher-tier IEMs remain expensive enough that resale, rather than repair, is the typical path for cosmetic damage.