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Network Audio Serve


More storage capacity and even higher performance

One year after the HFAS1’s debut:Introducing a high-end model sporting the “X”



The HFAS1-XS20U builds on the basic design of the popular HFAS1-S10U by adding an X-Cluster SSD unit designed specifically to
deliver high 2 TB storage capacity and the high level of quality required by audio applications.
This high-end fidata network audio server also utilizes a steel chassis that’s 3.2 mm thick for significantly higher rigidity so that it can
deliver an even higher level of performance.
*Apart from the X-Cluster SSD, the HFAS1-XS20U shares its circuit design and software with the HFAS1-S10U.

X-Cluster SSD unit designed specifically for audio applications

Instead of simply utilizing a single, large SSD,
fidata incorporates a new technology known as X-Cluster Storage Technology to deliver high storage
capacity along with the high quality required of audio components.

Dedicated X-Cluster SSD unit for audio

The X-Cluster SSD was developed specifically for the HFAS1-XS20U.
This cluster stripes data uniformly across two SSDs. The resulting ability to access data uniformly across all SSDs in the cluster smooths the load on the power supply load by limitingdeviations in power consumption. In addition, the HFAS1-XS20U features a pair of dedicated linear power conditioners that provide clean power.

X-Cluster SSD

X-Cluster Storage Technology

Designers of audio devices must exercise maximum care with regard to power supplies. Featured in the HFAS1-XS20U, X-Cluster Storage Technology is a new, proprietary fidata technology developed from an audio storage perspective to deliver high SSD storage capacity, a more stable power supply, and reduced noise.

A cluster of four SSDs

The HFAS1-XS20U incorporates two X-Cluster SSD units, one on the left and one on the right, for a total of four SSDs. The result is an enormous 2 TB cluster of storage configured in a way that reduces power supply fluctuations caused by uneven data access.

Software RAID

Striped(RAID 0) or mirrored(RAID 1)

X-Cluster SSD

Hardware RAID

Striped(RAID 0)

mirrored(RAID 1)

Linear power conditioners

In addition to the HFAS1’s power supply circuit, which consists of a dedicated switching power supply for the storage subsystem and a dedicated power generation circuit that has been tuned with numerous capacitors, the HFAS1-XS20U adds a pair of linear power conditioners for its X-Cluster SSD units. This design contributes greatly to more stable power supply performance.

Linear power conditioners




Significantly increased rigidity
thanks to a steel chassis that’s 3.2 mm thick

The HFAS1-XS20U uses a steel plate that is 3.2 mm thick to increase its chassis rigidity. We revisited both the material and the surface finish of the base steel plate, which is 1.4 times thicker than the previous design. The new model’s hot-rolled steel features a black chromate finish, preserving the fidata’s well-received appearance while maximizing its chassis rigidity.

that’s 3.2 mm thick

Comparison HFAS1-XS20U & HFAS1-S10U

Storage capacity 2.0TB 1.0TB
SSD capacity and quantity 500 GB × 4 500 GB × 2
<X-Cluster Storage Technology> Yes No
X-Cluster SSD Yes (2) No
Linear power conditioners Yes (2) No
Base steel plate 3.2 mm thick
(fabricated from 3 kg hot-rolled steel)
2.3 mm thick
(fabricated from 2 kg cold-rolled steel)
fidata CD ripping Yes Yes
fidata CD transport Yes Yes
Maximum power consumption Approx. 32 W Approx. 25 W
Weight Approx. 7.3 kg Approx. 6 kg


Operating environment

(for configuration of Twonky Server operation and HFAS1-XS20U settings, etc.)

Supported operating systems
  • Windows 11
  • Windows 10 (32- / 64-bit)
  • Windows 8.1 (32- / 64-bit)
  • Windows 8 (32- / 64-bit)
  • Windows 7 (32- / 64-bit)
  • macOS 10.7 ~ 10.15
Supported browsers
  • Internet Explorer 9 / 10 / 11
  • Microsoft Edge 25 / 84 / 93
  • Safari 6 / 7 / 8 / 9 / 10 / 13 / 14 / 15
Supported operating systems
  • iOS 8.0.2 ~ 15
  • Android 4.1 ~ 12
  • ipad OS 13 ~ 15
Supported file formats (extensions)
wav, mp3 , wma , m4a , m4b , ogg , flac , aac , mp2 , ac3 , mpa , aif , aiff , dff , dsf


USB DAC Supported file formats(extensions)
wav, aiff , aif , m4a , flac , dff, dsf , mp3 , aac , ogg
USB DAC output formats(sampling rates)
PCM format(44.1kHz、48kHz、88.2kHz、96kHz、176.4kHz、192kHz、352.8kHz、384kHz、705.6kHz、768kHz)
DSD format(DoP)(2.8MHz、5.6MHz、11.2MHz)
DSD format(DirectDSD)(2.8MHz、5.6MHz、11.2MHz、22.5MHz)
USB DAC output formats(bit depth)
PCM format(16-bit、24-bit、32-bit), DSD format(DoP、DirectDSD)(1-bit)

LAN DAC (Diretta)

LAN DAC Supported file formats(extensions)
wav, aiff , aif , m4a , flac , dff, dsf , mp3 , aac , ogg
LAN DAC output formats(sampling rates)
PCM format(44.1kHz、48kHz、88.2kHz、96kHz、176.4kHz、192kHz、352.8kHz、384kHz、705.6kHz、768kHz)
DSD format(2.8MHz、5.6MHz、11.2MHz)
LAN DAC output formats(bit depth)
PCM format(16-bit、24-bit、32-bit), DSD format(1-bit)

HFAS1-XS20U Hardware specifications

LAN interface
  • Transmission standards
  • Connectors
  • 1000BASE-T / 100BASE-TX / 10BASE-T
  • RJ-45 × 2 (Auto MDI / MDI-X compatible)
USB ports Connectors USB2.0 × 1
Networking Standard compliance UPnP AV, DLNA 1.5
Supply voltage AC100V-240V 50 / 60Hz
Power connector 3-pin inlet
Power consumption Rated for 32 W
External dimensions (excluding protruding parts) Approx. 350 (W) × 350 (D) × 65 (H) mm
Weight Approx. 7.3 kg
Operating temperature range 5℃ to 35℃
Operating humidity range 20% to 85% (non-condensing)
Accessories Power cords (3 types), user manual
Product warranty 2 years from date of purchase
Country of manufacture Japan
triman Matériel d'emballage
・Carton principal
・Boite cadeau
・Matériau de rembourrage
・Boîte d'accessoires

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