The creation of Eternal Research founder Alexandra Fierra, The Demon Box is an experimental music device, that harnesses an unlikely sound source: electromagnetic fields. Those same pesky EMF emissions that normally cause interference and annoyance to no end in your studio, are captured, amplified, and then are magically transformed into something…musical. Go figure. In a market where new gear drops daily and much of it feels like a slight variation on a familiar theme, the Demon Box stands out as something that truly does something new: I’ve never worked with a device that approaches sound creation quite like this. Fans of left-field instruments from makers such as Landscape, ERRORinstruments, and SOMA Laboratory will immediately feel right at home here.
The Demon Box doesn’t offer pitch control in any traditional sense, and instead, delivers shifting textures, unstable tonal clusters, and evolving noise beds that feel alive, organic, and unpredictable. It’s a kind of sonic weather system generated by the invisible electromagnetic world taking place all around you. Chaotic, expressive, and responsive, it invites a different way of thinking about composition and creation.
Where it truly shines is in its ability to convert EMF activity into both MIDI and CV data, so that once connected to a synth, modular system (or both), the device transforms the electromagnetic activity in your space into a generative performance engine.While doing this, it also simultaneously outputs EMF information across three CV channels, allowing you to drive oscillators, modulate filters, or animate any other Eurorack or synth parameter with the same invisible forces that shape its MIDI output. Power drills, electric toothbrushes, mobile phones, laptops…anything that emits a field becomes a musical collaborator. This functionality, this unconventional pairing, is easily the highlight of the instrument: you’re not just fishing for noise; you’re uncovering patterns and gestures hidden in everyday electromagnetic life. The results are unpredictable and inspiring and it's as close to an electronic nether world as I've ever been in my studio.
The Demon Box has three audio channels with options to pass audio directly, or to blend the inductors in various configurations. Functionally, it requires a strong signal to interact effectively, and I tested these inputs with guitar, line-level synths, and Eurorack signals, having the most success with the higher output found in Eurorack sources. In some instances I needed to amplify the signal before entering the realm of the Demon Box to get more usable results. While the audio channels aren’t the main attraction, the routing options are there for users who may find specific applications for them and expand on the creative possibilities the Demon Box offers up.
Visually, the Demon Box is a work of art. Its odd and intriguing triangular design is encased in heavy-duty steel and topped with substantial metal knobs. It’s an instrument you immediately want to display on a dedicated stand, both to admire when not in use, and to showcase in your studio or live setup. I can easily imagine it populating the Instagram feeds of multi-instrumental experimentalists, sitting alongside Lyras, OP-Zs, and esoteric pedals, glowing like a ritual object in a dim, yet ever-evolving, DMX-controlled lighting landscape.
If there are some things that I’d love to see Eternal Research explore a bit more with the Demon Box, it’s leaning further into the generative side. Pitch quantization would be a fantastic addition, as snapping chaotic incoming data to scales or rhythmic grids could unlock entirely new musical shapes without compromising the Demon Box’s wild character. Onboard effects could also expand its creative palette, providing even more expressive potential as well, especially if they were in keeping with the Demon Box's extremely experimental nature.
The Demon Box is an incredibly unique creation. Unapologetically weird, deeply inspiring, and aimed squarely at the freakers, tweakers, and sonic explorers, it’s a bold and impressive debut. Eternal Research is clearly brimming with ideas, and if the Demon Box is any indication of where they’re headed, their future is going to be very exciting.

Price: $999

eternalresearch.com