Innuos STREAM3 Music Streamer

The STREAM3 is the larger of the two Stream Series chassis and the one a serious digital front end is built around. A 13th-generation Intel quad-core processor, eight gigabytes of industrial DDR5 memory, a real-time kernel, and the full ARC6-CX power architecture — the engineering Innuos brought down from the company's flagship and rebuilt for a chassis the size of a traditional component. The result is a streamer whose noise floor sits where the listener wants it to sit and whose timing locks the way a reference digital source is supposed to lock.

The power story is the heart of the design. The ARC6-CX module, developed by Innuos in collaboration with Dr. Sean Jacobs, sits inside the STREAM3 chassis as an independent power subassembly. A 300-volt-amp toroidal transformer feeds a bank of Mundorf capacitors totaling 132,000 microfarads of reservoir capacitance, regulated down to clean DC by a set of dedicated low-noise stages — one per domain inside the streamer. The processor sees its own rail. The clock sees its own rail. The output stage sees its own rail. The medical-grade AC filtering at the inlet keeps mains-borne noise from reaching the audio circuit at all. The customer hears the consequence of those choices the way the customer hears the consequence of a great preamp's power supply: a calm in the background that lets the music come forward.

The chassis is 420 millimeters wide, 330 deep, 85 tall — the dimensions of a serious source component — and weighs nearly 13 kilograms. The body is ten-millimeter CNC-machined aluminum, finished to the standard of the cabinetry around it. The design is meant to share a rack with a reference DAC, a reference preamp, and a reference amplifier, and to look correct doing it.

The Digital Output Module bay accepts the full set of Innuos boards. The Standard DAC delivers RCA, optical, and coaxial S/PDIF — the right answer when the streamer feeds a vintage integrated amplifier or a DAC that prefers a clean S/PDIF. The Performance DAC steps the internal conversion to 32 bits at 768 kilohertz with native DSD512. The Phoenix DAC adds a dual-mono AKM converter with balanced XLR output, for the customer building a balanced front end. The PhoenixUSB regenerates and reclocks the USB feed to an external DAC. The PhoenixI2S delivers the streamer's signal over I2S to a DAC that accepts the format. The SPDIF board adds AES output. The customer chooses the board at order time based on the DAC the STREAM3 will sit upstream of; the choice is meaningful and Alma will guide it.

Storage is internal — an M.2 NVMe drive at two, four, or eight terabytes, holding the library locally on the chassis where the music can be served without ever leaving the box. The Sense operating system handles the catalog, the playback, the streaming services, and the integration with Roon, HQPlayer NAA, and AssetUPnP. The customer interacts with the music through the Sense app on iOS or Android; the app is the layer that disappears and lets the music come forward.

Networking is two 2.5-gigabit Ethernet ports, bridged, for the customer who wants the streamer on a clean wire to the rest of the network. A four-millimeter chassis grounding port at the rear lets the streamer be tied into the system's ground plane — a small touch that makes a difference in a heavily-grounded reference system.

What the STREAM3 delivers in the room is the experience a serious analog listener is looking for from a digital source. Voices sit forward and breathe. Inner detail of a complex passage holds together. The sense of the recording space — the back of the hall, the air around the microphones, the small movements the engineers heard in the room — comes through the system rather than being implied at it. This is the front end a reference digital chain is built around.

Available at both Alma showrooms by appointment. The STREAM3 rewards system-level conversation about the DAC, the network, and the room; we are happy to spend that time before the order is placed.