Next-level music server with analog finesse.

A new benchmark for digital audiophile experience. XACT S1 takes digital audio playback to new heights with its naturally sophisticated sound and high-class user experience.


Highlights:
- Natural, organic and sophisticated sound
- Immersive, emotionally resonating experience
- High-class, seamless user experience
- Developed from the ground up for 6 years


Personal audio quest fulfilled
The creation of XACT S1 stems from my quest to create superbly sounding digital audio transport for myself, which brought me into high-end audio hardware development.

A lifetime of experiences inside
S1 synthesizes all my audio research findings and experience in developing innovative audiophile hardware (JCAT) and software (JPLAY). Every product I’ve developed over the years has made an important contribution towards the creation of XACT server.

6 years of development and tuning
XACT S1 is a unique device created entirely from the bottom up. The development of the server in this shape started in 2016. After 3 years, I’ve had a final motherboard. The following 3 years were strictly dedicated to fine-tuning. This is a device I’ve worked on the most in my entire life.
- Marcin Ostapowicz (designer)

Not an another PC. A completely new device
Most streaming products available today are made with standard, ready-to-use mini-PC motherboards designed for office or home entertainment. However, these motherboards have noisy power converters that interfere with other hi-fi components and produce an irritating “digital” sound. Some companies try to mitigate the issue by upgrading their power supplies, but this doesn’t address the root cause. That’s why developing an entirely new motherboard from scratch with only audio playback in mind was the only way to go with XACT S1.

100% linear power delivery. Truly everywhere
It’s the first music server that puts so much emphasis on power quality ever. The motherboard itself has only linear regulators and runs solely on linear power. The dedicated power source is 100% linear without any switching components. XACT S1 delivers unmatched electrical performance. There’s nothing else like it.

Hardware and software in harmony. The definition of synergy
Over more than 10 years of developing JPLAY, I’ve learned first handedly that the software has as much impact on the sound quality as the hardware platform itself. Through meticulous testing, I’ve explored all possible optimizations of the operating system and player’s code, ultimately identifying the most harmonious combination for the S1’s hardware.

Fine-tuned by ear with every minor change. For years
I’ve done extensive listening on S1 every time I tweaked something. Every minor change was tested and logged by me personally. Every hardware component, every OS update, every modification of settings.

Simple setup, just 1-click of the button
- JPLAY app brings unrivaled convenience managing your library
- New music discovery
- Streaming & local files accessible in one place
- Native Tidal & Qobuz discovery features
- One app to rule them all
- Effortless management and discovery with JPLAY app

XACT OS written from scratch and optimized for the hardware
{ LIFETIME SUBSCRIPTION INCLUDED } click on link

Additional JPLAY Features
- Extended playlist management
- Advanced search and sort
- Aggregated activity stats
- Multiple library views
- …and many more!

Only the finest components. Obsessive attention to details.

Every component in XACT S1 is hand-picked or developed from the ground up and thoroughly tested by ear. No other company has gone to such lengths in a music server design.


100% custom motherboard:
Developed exclusively for high-end music playback
World’s first 100% linear powered motherboard

OPTIMO X1 linear power supply section:
Delivering 140,000 uF

Clock (oven controlled oscillator):
State-of-the-art ±0.005 (±5 ppb) stability OCXO
Delivers the most stable timing in the presence of environmental stressors such as airflow, temperature perturbation, vibration, shock and electromagnetic interference (EMI)

Digital outputs:
2x USB Audio 2.0 (main and without 5V power bus)
with gold plated high durability EMI shielded USB connectors

4TB SSD drive:
Specially selected for audio performance
8TB capacity available on request

XACT LINK:
Custom designed SSD drive cable

LAN inputs:
6x Gigabit Ethernet for audiophile network
switch & router (alternative functionality) S1

EMI shielded RJ-45 connectors:
Gold plated high durability with
built-in 12-core transformers for improved isolation

LED-off feature:
For LAN ports to counteract noise

Chassis:
Aluminum, fan-less design

Custom made XACT OS:
Loaded from a specially selected SLC SD card

JPLAY playback software:
Supporting TIDAL & Qobuz streaming services
and local files (from internal SSD)

Native bit-perfect playback:
For DSD up to DSD512 & PCM hi-rez up to 768 kHz, 16-32 bits

Supported file types:
DSD: DSF, DFF, PCM: FLAC, Apple Lossless (ALAC)
WAV, AIFF; Lossy: MQA (pass-through)

Remote control:
JPLAY iOS app { lifetime license included }

Dimensions:
17.3 x 12.4 x 3.4” (WxDxH)

Weight:
20 pounds