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In 2026, audiophiles are faced with a compelling choice: the Hifiman He400se and the Sennheiser HD 660 S. Both headphones are highly regarded in the high-end audio community, but they cater to different preferences and listening styles. This article compares these two models across various aspects to help enthusiasts make an informed decision.
Design and Build Quality
The Hifiman He400se features a lightweight aluminum frame with a minimalist aesthetic. Its open-back design allows for a natural soundstage but makes it less suitable for noisy environments. The ear cups are padded with plush velour, providing comfort during extended listening sessions.
The Sennheiser HD 660 S boasts a robust construction with a metal-reinforced headband and durable ear cups. Its design is also open-back, emphasizing a wide soundstage. The ear pads are made of soft velvet, enhancing comfort and breathability.
Sound Quality and Performance
The Hifiman He400se delivers a detailed and airy sound profile with a slight emphasis on bass, making it suitable for genres like jazz and electronic music. Its planar magnetic drivers provide fast response times and low distortion.
The Sennheiser HD 660 S offers a more balanced and natural sound signature. It excels in reproducing vocals and acoustic instruments with clarity. Its dynamic drivers produce a rich bass response without overwhelming the mids and highs.
Comfort and Fit
Both headphones are designed for long listening sessions. The He400se’s velour ear pads and lightweight frame make it comfortable for hours, though some users may find the clamping force slightly tight initially.
The HD 660 S’s velvet ear pads and adjustable headband provide a snug yet comfortable fit. Its lighter weight and ergonomic design reduce fatigue during extended use.
Connectivity and Compatibility
The He400se is a wired headphone with a 6.3mm jack, compatible with most amplifiers and DACs. It does not support wireless connectivity.
The HD 660 S also features a wired connection with a 6.3mm jack. It is compatible with a wide range of audio sources but lacks wireless features, aligning with its audiophile focus.
Price and Value
As of 2026, the Hifiman He400se is priced slightly lower than the Sennheiser HD 660 S, making it an attractive option for budget-conscious audiophiles seeking high performance.
The HD 660 S, while more expensive, offers a refined sound signature and build quality that justifies its premium price for serious listeners.
Conclusion
Choosing between the Hifiman He400se and the Sennheiser HD 660 S depends on individual preferences. If you prioritize a detailed, energetic sound with a focus on bass, the He400se is an excellent choice. Conversely, for a balanced and natural audio experience, the HD 660 S remains a top contender. Both models continue to uphold their reputations in 2026 as premier open-back headphones for audiophiles.