Sennheiser Brings Back Wired Audio with the New CX 80U and HD 400U

In a market saturated with wireless earbuds and noise-cancelling headphones that require constant charging, Sennheiser is making a case for the simplicity of a wired connection. The German audio brand has announced the launch of the CX 80U earbuds and the HD 400U headphones, two new models that update their popular predecessors with modern USB-C connectivity.

The move acknowledges a shift in consumer electronics: the 3.5mm headphone jack is virtually extinct on flagship smartphones, but USB-C ports are universal across phones, tablets, laptops, and even handheld gaming consoles like the Steam Deck. By switching to a native USB-C connector, Sennheiser is positioning these devices as “plug-and-play” solutions for users who want high-quality audio without the hassle of dongles, Bluetooth pairing, or battery anxiety.

High-Res Audio for Everyone

The primary technical advantage of this update is the digital signal path. Because these headphones connect digitally via USB-C rather than through an analog jack, they bypass the often-subpar internal DACs (Digital-to-Analog Converters) found in many budget devices. Both the CX 80U and HD 400U support 24-bit/96 kHz digital audio playback, ensuring a lossless, high-resolution listening experience directly from the source. This makes them particularly appealing for subscribers of hi-res streaming services like Apple Music or Tidal who want to hear the full detail of their tracks without compression artifacts.

CX 80U: Compact Clarity

The CX 80U is the in-ear option, serving as the direct successor to the CX 80S. It retains the lightweight, minimalist design of the original but re-tunes the audio for a “balanced yet punchy” sound signature. Sennheiser includes three sizes of ear tips to ensure a proper seal, which is critical for passive noise isolation and bass response. For daily utility, the inline remote features a high-quality MEMS microphone, making it a reliable choice for taking calls or jumping into video conferences without the robotic voice quality often associated with cheap Bluetooth buds.

HD 400U: Over-Ear Immersion

Senn HD400U ProductImages Hi Res Quality (1)

For those who prefer an over-ear form factor, the HD 400U updates the legacy of the HD 400S. It features a closed-back design that naturally blocks out ambient noise, making it suitable for commuting or office work. The sound profile is described as “bass-driven,” catering to modern listening tastes while maintaining the clarity Sennheiser is known for. A practical touch is the detachable cable, which adds a layer of durability—if the cable frays, you can replace it rather than tossing the entire headphone. The headset also folds down for storage in the included pouch, keeping it backpack-friendly.