The Matrix Audio Mini-i 4 and Mini-i Pro 4 are compact digital-to-analog converters designed for listeners who want more than a simple standalone DAC. Both models combine digital conversion, network streaming, input switching, app-based control, and variable volume in a chassis measuring approximately 22 x 18 x 5 centimeters. That makes them small enough for a desktop, media console, or minimalist hi-fi rack, while still offering the kind of connectivity that can anchor a modern two-channel system. The two models are closely related: the Mini-i 4 covers the core DAC/streamer/preamp role, while the Mini-i Pro 4 adds a dedicated headphone amplifier, an included RM5 remote control, and an additional black finish option.
A compact DAC platform with serious system ambitions
At the center of both the Mini-i 4 and Mini-i Pro 4 is an ESS Sabre ES9039Q2M DAC chip, partnered with a high-quality output stage and supplied by a low-noise power supply. Those details matter because a DAC is not defined by the converter chip alone. The output stage, power supply implementation, input handling, and control architecture all influence how easily a component can be integrated into a broader system.
The appeal of these Matrix Audio models is that they are not limited to one narrow task. They can serve as a DAC for a computer, a network streamer for online services and local libraries, a digital hub for TV audio via HDMI eARC, and even a volume-controlled front end for active speakers or a power amplifier. For many prospective owners, that flexibility is the central attraction: one compact box can take over duties that might otherwise require several separate components.
Digital inputs that cover computers, transports, and TV audio
The Mini-i 4 and Mini-i Pro 4 provide multiple digital inputs, including coaxial, optical, asynchronous USB-B, and HDMI with eARC support. The coaxial and optical inputs accept music signals up to 24-bit/192kHz, making them useful for CD transports, streamers, televisions with optical output, or other conventional digital sources.
The USB-B input is specified for PCM up to 24-bit/768kHz, MQA up to 384kHz, and DSD up to 11.2MHz in both DoP and Native formats. That level of format support gives computer-audio users considerable headroom, especially for high-resolution music libraries and playback software that can output native or DoP DSD. Even if a listener’s current library is more modest, broad USB support can extend the useful life of the component as sources and software change.
HDMI eARC is another practical inclusion. It allows the Mini-i units to be connected to a compatible television, turning them into a bridge between a video system and a two-channel audio setup. For users who want better integration between music listening and TV sound without moving to a multichannel AV receiver, eARC can be a highly useful feature.
Streaming support for network-based listening
Both Mini-i models support network streaming over Gigabit Ethernet. Their streaming options include Roon Ready operation, AirPlay, DLNA/UPnP playback from a NAS, Tidal Connect, and Spotify Connect. Internet radio is also covered through vTuner and Radio Paradise.
This range of options makes the Mini-i 4 and Mini-i Pro 4 adaptable to different listening habits. A Roon user can fold the unit into an existing Roon environment. Someone with a NAS-based music archive can use DLNA/UPnP. Listeners who prefer direct service control can use Tidal Connect or Spotify Connect. AirPlay adds convenience for Apple-device users and casual playback. The result is a component that does not force every owner into a single control method or music ecosystem.
MA Remote app and front-panel touchscreen control
Matrix Audio’s MA Remote app is a key part of the user experience. It is designed to help with initial network setup and provides access to important functions including input selection and volume adjustment. The app also supports access to Tidal, Qobuz, and Highresaudio, giving users a central way to browse and control music from supported services.
Although these units are likely to be operated primarily by app, Matrix Audio has also included a 3.46-inch LCD touchscreen on the front panel. That is a valuable design choice for daily use. A front display and direct touch control can make the component easier to operate when a phone or tablet is not immediately available, and it gives the hardware a clearer identity as a self-contained hi-fi device rather than a black-box streamer hidden on the network.
Volume control for simplified systems
Both the Mini-i 4 and Mini-i Pro 4 include volume control, which can be operated through the MA Remote app and switched on or off. This allows either model to connect directly to a power amplifier or to a pair of active speakers. For listeners building a streamlined system, that can reduce the need for a separate preamplifier.
This capability is especially relevant in compact living spaces, desktop listening setups, and modern active-speaker installations. A user can feed the Matrix Audio unit with streaming services, a computer, a TV over HDMI eARC, and other digital sources, then control output level from the same device. If the system already includes a conventional integrated amplifier or preamplifier, the ability to disable volume control also helps the Mini-i function more like a traditional fixed-output source component.
Analog input expands the role beyond digital-only use
The inclusion of an analog RCA input gives the Mini-i 4 and Mini-i Pro 4 more flexibility than many digital-first components. The input includes an adjustable gain factor and is intended for use with standard line-level sources or even a turntable. The source information does not specify an onboard phono stage, so turntable users should consider the requirements of their cartridge and associated phono amplification, but the presence of an analog input still broadens system possibilities.
For someone with a single analog source, this can be particularly useful. A compact system might include a streamer/DAC as the main hub, a TV connection, and one analog source, all without needing a full-sized preamplifier solely for input switching. That is one of the more practical design decisions in the Mini-i concept.
What the Mini-i Pro 4 adds for headphone listeners
The biggest functional difference between the two models is the headphone section. The Mini-i Pro 4 includes a dedicated headphone amplifier with both a 6.35mm unbalanced output and a 4.4mm balanced output. This is not described as a minor convenience socket; the published specifications point to a properly considered headphone stage.
For the 6.35mm output, the specified A-weighted signal-to-noise ratio is 116dB, with THD+N of 0.0004 percent over the full audio bandwidth at 4VRMS. Output impedance is listed at 11 ohms, gain at 14dB, and power at 1,200mW into 33 ohms, 260mW into 300 ohms, and 130mW into 600 ohms. The 4.4mm output is specified with a 117dB A-weighted signal-to-noise ratio, 22-ohm output impedance, and power of 2,200mW into 33 ohms, 950mW into 300 ohms, and 500mW into 600 ohms.
Those figures indicate that the Pro model is the more natural choice for users who want a combined loudspeaker and headphone front end. It can sit on a desk or equipment shelf as a streamer, DAC, volume controller, and headphone amplifier in one compact unit. The standard Mini-i 4 remains the simpler option for listeners who do not need headphone outputs.
Conclusion
The Matrix Audio Mini-i 4 and Mini-i Pro 4 are most suitable for listeners who want a compact, network-capable DAC that can also act as a system hub. Their strongest documented qualities are broad digital input support, HDMI eARC, Gigabit Ethernet streaming, Roon Ready and Connect-service compatibility, MA Remote app control, a front-panel touchscreen, switchable volume control, and the added flexibility of an analog RCA input. The Mini-i 4 is the more focused choice for speaker-based systems built around active speakers, a power amplifier, or an existing amplifier setup. The Mini-i Pro 4 is aimed at users who also want an integrated headphone amplifier, balanced 4.4mm headphone output, included RM5 remote, and the option of a black finish. Neither model is just a basic DAC; both are designed as compact control centers for contemporary two-channel listening.
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