Matrix Audio’s SI-1 Aims to Silence the Network Noise

Streaming is now the default source in plenty of hi-fi systems. But is the network feeding your streamer as clean as you assume? The data may be robust; the electrical environment it rides on often isn’t.

Routers, switches and other household electronics can introduce noise, ground potential differences and electromagnetic interference that ultimately find their way into sensitive audio hardware.

Matrix Audio believes it has a solution. The company has introduced the SI-1 Audio Grade Network Isolator, a compact device that electrically separates a streamer or network audio component from the wider home network using optical isolation technology.

The SI-1 converts the incoming Ethernet signal to optical internally, breaking the direct electrical path between the network and the connected audio device. Matrix Audio says this approach prevents noise and interference travelling down the Ethernet cable from reaching the streamer, potentially lowering jitter and improving overall signal integrity.

The key move is optical isolation. A dual-channel transmission design keeps transmit and receive paths separate for stable two-way communication. One Gigabit Ethernet input and one isolated output place it neatly between the router and the streamer.

Internally, Matrix Audio has equipped the SI-1 with a dual-femtosecond clock architecture to improve timing precision for network data transmission. Power is supplied via a dual-winding toroidal transformer epoxy-potted for reduced vibration and electromagnetic leakage, which feeds multiple low-noise linear regulators.

The physical design reflects Matrix Audio’s familiar industrial styling, with a fully CNC-machined aluminium enclosure and clearly separated Ethernet ports. The output port also incorporates an isolation washer to further minimise potential grounding paths. A front-panel status indicator shows connection activity, while the Ethernet LEDs can be disabled for those who prefer a darker listening environment.

In practical terms, the SI-1 is designed to be deployed at the boundary between the home network and the audio system. It can sit directly before a streamer, DAC with network capability, or between a router and a dedicated audio network switch. The goal is to create, as Matrix Audio describes, a cleaner digital environment for music streaming devices.

Network isolation products have become an increasingly visible category in the digital audio ecosystem as streaming playback continues to mature. While opinions differ on the extent to which network noise affects sound quality, the market for devices designed to minimise such factors continues to grow.

The Matrix Audio SI-1 is available now priced at US$659 | A$1,199. 

For more information visit Matrix Audio