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To all USB audio devices
High-performance filter that suppresses common mode noise and increases USB signal purity
Fidelix HiFi USB Noise Filter is an accessory developed to reduce unnecessary high-frequency noise that enters from PCs and digital devices via USB, and to improve the quality of the audio playback environment. A configuration that combines a common mode choke and ferrite beads effectively suppresses common mode noise superimposed on the signal line. Available in two exterior colors, silver and black, it blends naturally with the exterior of your system.
The effectiveness of this product has been confirmed by ROHDE & SCHWARZ measurements over a wide band of 2MHz to 43.5GHz. High-frequency noise originating from the CPU and memory clock inside the PC, as well as their harmonic components, is clearly reduced, and it is backed by actual measurement, not just a theoretical design.
The effectiveness of this product has been confirmed by ROHDE & SCHWARZ measurements over a wide band of 2MHz to 43.5GHz. High-frequency noise originating from the CPU and memory clock inside the PC, as well as their harmonic components, is clearly reduced, and it is backed by actual measurement, not just a theoretical design.
This filter has a built-in noise reduction circuit not only for the signal line but also for the USB 5V power line. It operates effectively in both bus-powered and self-powered configurations, and is designed with inrush current and power feedback stability in mind. This provides a clean power environment without impairing the operation of USB-connected devices.
The built-in filter alone is effective enough, but when combined with Fidelix's ultra-low noise external power supply (5V 1A), the visibility of the space is further improved, and the subtle overlap of sounds and sense of depth become even clearer. When playing digital audio, you can feel that lowering the noise floor is directly linked to musical expression.
The Fidelix HiFi USB Noise Filter is a reliable solution backed by solid theory and empirical measurements for users who prioritize signal purity and a sense of silence in USB-DACs, network players, and PC audio environments.
| Device Size | 50mm × 30mm × 20mm |
|---|---|
| Accessories | None (for set purchases, a 5V AC adapter is included) |
The HiFi USB Noise Filter is designed to reduce noise on both the data signal line and the 5V power line, with a particular focus on improving sound quality in PC audio environments. Its effectiveness in reducing common-mode noise has been verified through objective methods such as eye pattern measurements, highlighting an approach supported not just by theory but also by actual measurements.
Many users report that it "improves the clarity of distant sounds and makes the spatial experience feel more transparent." By suppressing noise originating from clocks inside the PC and high-frequency components, it reduces sound muddiness and gives the impression of a naturally emerging, deep soundstage. Some users also note that it softens the harshness and aggressive qualities often associated with digital playback, making long listening sessions less fatiguing.
From a technical perspective, it has been observed that eye pattern measurements of USB 2.0 High Speed signals show reduced ringing and improved waveforms. This suggests a contribution to reduced timing jitter, supporting the effectiveness of the design philosophy that addresses both data signal and power noise.
As a result, the HiFi USB Noise Filter fundamentally improves noise and timing instability—common weaknesses in digital audio—enhancing musical clarity and spatial expression. It is widely supported by users as a practical item with high usability. It is also highly regarded in terms of cost-performance, making it a strong choice for users seeking to elevate the quality of their PC audio environment.
