XACT S1 Music Server  
A new benchmark for digital audiophile experience from JCAT
 
XACT S1 takes digital audio playback to new heights with its naturally sophisticated sound and high-class user experience.
 
Created by Marcin Ostapowicz, the founder of JCAT and JPLAY brands and author of some of the most innovative high-end audio products, including the world’s first audiophile network card.
 
• NATURAL, ORGANIC & SOPHISTICATED SOUND
 
• IMMERSIVE, EMOTIONALLY RESONATING EXPERIENCE
 
• HIGH-CLASS, SEAMLESS USER EXPERIENCE
 
• DEVELOPED FROM THE GROUND UP FOR 6 YEARS
 
Digital that doesn’t sound like digital. More like vinyl. Or a private concert.
"XACT S1 delivers on my vision of audiophile sound: natural, organic with analog sophistication and lifelike imaging. It’s hard to believe it’s digital."
 
A personal dream come true. Six years in the making.
 
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."
 
Designed and developed from square one. Fine-tuned by ear. Obsessively.
100% custom motherboard developed exclusively for high-end music playback
Extremely low-jitter OCXO clock with #5 ppb frequency stability
Dedicated Optimo™ X1 power supply
Specially selected 4TB SSD drive for audio performance
 
Not 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."
 
Extensively ear-tested with every tweak
XACT OS written from scratch and optimized for the hardware
High-class everything. Not only the sound.
1-click setup. The simplest.
 
One app to rule them all.
Effortless management and discovery with JPLAY™ app.
 
CONFIGURATIONS:
XACT S1 as a music server / player — basic setup

XACT S1 as a a network switch / router + S1 as a music server / player — dual setup for best sound quality
 
• EXTREMELY LOW-JITTER OCXO CLOCK WITH ±5 PPB FREQUENCY STABILITY
• XACT LINK™ DRIVE CABLE DEVELOPED EXCLUSIVELY FOR S1
• EXTREMELY RESISTANT OS SD CARD DEVELOPED FOR MILITARY CONDITIONS
• AUDIOPHILE NETWORK SWITCH & ROUTER (ALTERNATIVE FUNCTIONALITY)
• NICHICON MUSE FLAGSHIP CAPACITORS DELIVERING EXCEPTIONAL RESOLUTION AND NATURAL SWEETNESS
• INDUSTRIAL-GRADE SSD
 CAREFULLY SELECTED FOR ITS UNIQUE SOUND PROPERTIES*
• EASY MUSIC IMPORTING FROM USB DRIVES AND OVER NETWORK
 
*where SSD option is selected
 
****ALSO AVAILABLE XACT S1 EVO UPGRADED SERVER****
Either Order Standard S1, or Upgraded S1 EVO
—or, for existing S1 owners, call 0800 464 7274 for the Upgrade Only option (£5000)