The Sennheiser HD800S headphones, while lauded for their exceptional soundstage and detail, suffer from a prominent 6kHz peak that introduces harshness and sibilance. This unwanted frequency spike can lead to listener fatigue and detract from the overall enjoyment of these otherwise excellent headphones. Many users have struggled to find a satisfactory solution without compromising the HD800S's signature sound.This article reviews a novel 3D-printed filter designed to specifically address this 6kHz peak issue. Utilizing a unique combination of materials—a 3D-printed housing, acoustic damping foam, and precisely laser-cut stainless steel mesh—this filter offers a targeted solution without negatively impacting other frequency ranges or the headphone's overall sound characteristics. We'll examine the filter's design, installation process, effectiveness based on measurements, and ultimately, its impact on the listening experience.
Pros And Cons
- Fixes the 6 kHz peak on the HD800S headphones.
- Doesn't significantly change soundstage or timbre.
- Easy to install.
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The Problem: A Pesky Peak
The Sennheiser HD800S, a highly regarded headphone, suffers from a noticeable peak at 6kHz. This peak introduces harshness and sibilance, detracting from the overall listening experience. Many users find this problematic, leading to listener fatigue and a less enjoyable sound.
For years, I struggled to find a satisfactory solution. Existing EQ solutions often affected other aspects of the sound signature, compromising the HD800S's renowned soundstage and tonal balance. I wanted a fix that was both effective and unobtrusive.
The Solution: A 3D-Printed Filter
After extensive research and experimentation, I developed a 3D-printed filter designed to specifically target the 6kHz peak. This filter utilizes a unique combination of materials: a 3D-printed housing, special-density foam for acoustic dampening, and precisely laser-cut stainless steel mesh.
The mesh is strategically positioned to attenuate the problematic frequencies without negatively impacting other aspects of the sound. The filter is incredibly easy to install, requiring only the removal and replacement of four screws.
Sound Quality and Measurements
Measurements reveal a significant reduction in the 6kHz peak, bringing the frequency response closer to a flatter, more neutral profile. The filter effectively addresses the harshness and sibilance without sacrificing the HD800S's spacious soundstage or detailed timbre.

While the upper treble response may vary slightly based on individual ear anatomy and measurement systems, the impact on the overall listening experience is generally positive – a smoother, less fatiguing listening experience.

Final Thoughts and Conclusion
This 3D-printed filter provides a significant upgrade to the HD800S, resolving a major flaw without compromising its strengths. Combining the filter with a headband upgrade results in a truly exceptional listening experience. The ease of installation makes it an attractive option for those seeking to improve their HD800S or HD800 headphones.
While initially a personal project, the demand has led to the production of 120 pairs. Though currently available through a limited release, the design files may eventually be made publicly available. This solution provides a compelling improvement to an already great headphone, making it a worthwhile upgrade for any HD800S owner.