Matrix Audio - SI-1 - Audio-Grade Network Isolator

Active opto-isolation. Dual femtosecond clocks. Dual-winding encapsulated toroidal transformer. The Matrix Audio SI-1 network isolator eliminates network-borne electromagnetic interference, ground loops, and jitter from your digital audio system — returning the music background to deep black and the signal to its original integrity.

Pure Soundscape — Protecting Purity and Authenticity

Every network-connected audio component is exposed to a constant stream of electromagnetic interference, ground loop noise, and timing instability generated by the routers, switches, and other devices sharing its network. This interference is invisible and largely inaudible in isolation — but its cumulative effect on the music background, fine detail retrieval, and the naturalness of musical timing is real and measurable. The Matrix Audio SI-1 exists to eliminate it entirely.

A premium audio-grade network isolator designed as a key extension of the Matrix Audio ecosystem, the SI-1 brings active opto-isolation technology, dual femtosecond clocking, and a dual-winding encapsulated toroidal transformer to the network link between your router or switch and your digital audio player, streamer, or DAC. The result is a music background that returns to deep black — and a signal that arrives at your audio components with the integrity, timing accuracy, and freedom from interference that pristine digital audio demands.

Active Opto-Isolation — Cutting Every Path for Interference

The SI-1's active opto-isolation technology converts the incoming electrical network signal to light and back to electrical — completely breaking the electrical connection between the network source and the audio component. This approach effectively blocks electromagnetic interference generated by routers and switches, eliminates network device noise from interfering with audio signals, and cuts off ground loops that cause current noise from potential differences between different devices.

The electrical isolation rings on the output interface provide an unbreakable safety barrier for sensitive and expensive audio equipment — protecting against sudden risks including lightning strikes, power surges, and static electricity, as well as the continuous low-level interference of power grid noise.

Dual-Channel Fibre Optic Transmission — No Crosstalk, No Compromise

The SI-1's dual-channel fibre optic transmission architecture handles transmission and reception on completely independent, non-interfering channels — eliminating signal crosstalk at the source. Two built-in femtosecond clocks govern the timing of the transmission with a precision that minimises jitter and maximises data integrity. Combined with a dual-winding encapsulated toroidal transformer and multiple LDO (Low Dropout) linear power supplies, the SI-1 provides the stable, clean power delivery that precision femtosecond clocking demands — ensuring audio data integrity, reducing transmission errors, and reproducing audio details with exquisite clarity and natural musical rhythm.

CNC Unibody Aluminium Chassis

The SI-1 continues Matrix Audio's industrial design language — a one-piece CNC-machined aluminium alloy shell that provides superior build quality, premium tactile texture, and effective electromagnetic shielding against external interference. Front-panel connection status indicator lights make operating status clear at a glance. The rear-panel network port LEDs can be manually switched off to minimise light pollution in a dark listening room — a considered detail that underlines the SI-1's purpose as a serious audiophile accessory.

The Finishing Touch on Any Hi-Fi Upgrade Path

The SI-1 is designed for use between a network switch or router and any Ethernet-connected audio component — Matrix Audio streamers and DACs, as well as compatible equipment from other brands. For those who have already optimised their amplification, speakers, and source components, network isolation is frequently the most impactful remaining upgrade — removing a source of interference that sits upstream of every other improvement in the chain.

SI-1 Network Isolator Features

⚡ Active Opto-Isolation Technology

Converts the network signal from electrical to optical and back — completely breaking the electrical connection between source and audio component, blocking EMI, eliminating ground loops, and protecting sensitive equipment from surges and static.

⏱️ Dual Femtosecond Clocks

Two built-in femtosecond-precision clocks govern transmission timing with extraordinary accuracy — minimising jitter, maximising data integrity, and reproducing audio details with the clarity and naturalness that precise timing makes possible.

🔌 Dual-Channel Fibre Optic Transmission

Independent, non-interfering fibre optic channels for transmission and reception eliminate signal crosstalk at the source — combined with a dual-winding encapsulated toroidal transformer and multiple LDO linear power supplies for stable, clean power delivery.

🏗️ CNC Unibody Aluminium Construction

One-piece CNC-machined aluminium alloy chassis with front-panel status indicators, switchable rear-panel port LEDs for light pollution control, and the premium build quality that defines the Matrix Audio product family.

Editorial Blockquote

"With a pure heart, the SI-1 pays tribute to every Hi-Fi enthusiast — becoming the finishing touch on the path of upgrading a Hi-Fi system, allowing every love for good sound to be fulfilled." — Matrix Audio

At-a-Glance Bullets

• Active opto-isolation — completely breaks electrical connection between network and audio component
• Eliminates EMI from routers and switches
• Cuts off ground loops — eliminates current noise from potential differences between devices
• Protects against lightning strikes, power surges, and static electricity
• Dual femtosecond clocks — precise timing, minimised jitter
• Dual-channel fibre optic transmission — independent TX/RX, zero crosstalk
• Dual-winding encapsulated toroidal transformer
• Multiple LDO linear power supplies
• Network standards: IEEE 802.3 (10BASE-T), 802.3u (100BASE-X), 802.3z (1000BASE-T), 802.3ab (1000BASE-T)
• 1 x 1Gbps RJ45 input, 1 x 1Gbps RJ45 optically isolated output
• 2K MAC address table depth
• Front-panel power and connection status indicator lights
• Rear-panel port LEDs — manually switchable on/off
• CNC unibody aluminium alloy chassis — EMI shielding
• Power: AC 100-120V or 220-240V, 50/60Hz — less than 15W
• Dimensions: 120 x 205 x 44mm (W x D x H) — Weight: 1.54kg
• Compatible with Matrix Audio streamers and DACs, and any Ethernet-connected audio component

Closing Quote

"The music background returns to deep black. The signal arrives with the integrity it deserves. The Matrix Audio SI-1 — pure soundscape, protecting purity and authenticity."