Holosonic Beamforming

Compact spherical arrays

Our technology is built around compact spherical beamforming arrays — holosonic projectors that emit precisely directed beams of sound and let space do the rest. Instead of building a perfect, dead room, we use reflections and architecture as active parts of the instrument, creating explorable 3D sound sculptures in real‑world spaces.

Space as Medium

With architecture, not against it

Conventional systems try to make space disappear: dead rooms, heavy treatment, and surround arrays that only work from a single sweet spot.

Our instruments project into the room and let sound interact with surfaces and volumes, so you hear sound shaping the space — and the space shaping the sound — wherever you move.

One Platform Versatile use

Our instruments work in several spatial modes, so you can choose the workflow that matches your practice and tools, from simple setups to advanced research environments.

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Beamforming

Higher‑order ambisonic streams decoded to highly directional beams that can be steered and shaped for ultimate spatial resolution.

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Ambisonic

Higher‑order ambisonic decoding to the array for 3D soundfields with spectrally limited directivity.

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Multi-channel

Per‑driver discrete channel routing for intuitive DAW workflow, experimental composition or live patching.

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Volumetric

Multiple instruments distributed in space for holophonic soundfields, for example using 4DSound's engine, Logelloop's Acousmonium or IRCAM's SPAT.

Design Principles
Parametric, portable, precise

All Slovox arrays share one parametric design and matched electronics. That means consistent acoustic behaviour, predictable performance, and configurations that scale with your space and practice — from compact units that fit in cases to larger projectors that can carry a room.

  • Parametric family of layouts and sizes
  • Built to order, with room for customization where it matters.
  • Tuned and measured individually, with dedicated filters.
  • Matched amplification and control in portable racks.
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On the shoulders of giants
IEM Graz

This platform stands on pioneering research at IEM Graz by Franz Zotter, Matthias Frank, Stefan Riedel, Gerriet Sharma, and others — whose dedication work made it possible to orchestrate space with compact arrays, building on IRCAM’s original vision. We’re building from that foundation to make it practical, accessible and advance the field further.

Integration
Work with your tools

Our platform is designed to slot into existing spatial sound ecosystems rather than lock you into a proprietary stack. You can work with familiar hosts and plugin suites, as long as they provide sufficient multichannel capabilities. We can help you choose the right combination for your use case.

  • DAWs and live environments (Reaper, Max MSP).
  • Spatial plugin suites and engines — HOA/ambisonic toolchains, research platforms.
  • External diffusion and holophony engines where needed.

From Lab to Practice
Built in use, not on paper

Our technology has been developed inside our own artistic and research practice before being offered to others. We continue to evolve it with early adopters, labs, festivals, and venues — treating each deployment as a feedback loop that refines the platform for real‑world conditions, not just idealized test rooms.

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Next Steps
Choosing the right setup

Selecting a configuration is less about “bigger is better” and more about how you want to work with space. We prefer to start with your workflow, intended spaces and audiences, then propose an instrument that fits — and grows with you.

Spatial Sound Q&A

Ambisonics, beamforming, spherical arrays, Dolby Atmos, surround systems

What speakers reproduce ambisonics?
Any multi-channel array can reproduce ambisonics, provided the right decoder. Practically, 16+ channels are needed for 3rd order HOA). The arrays can be outside-in (dome, surround), or inside-out (spherical beamforming arrays).
 
What are ambisonic dome arrays?
Surround (dome) arrays use outside-in approach to decode HOA for fixed sweet-spot listening in the center of the array. Typical setups have anywhere between 16 and 96 speakers in a permanent installation. The room needs to be acoustically treated to minimize unwanted sound reflections that destroy spatial imaging. Slovox beamforming spherical arrays are an alternative approach to dome arrays.
What are spherical beamforming arrays?
Spherical beamforming arrays (Slovox Watermelons, IEM IKO, 393) can decode HOA ambisonic stream by projecting sound beams inside-out. They are portable, no sweet spot limitation, and do not require acousticaly dry rooms — reflections are wanted used to create sound sculptures. Because ambisonics rely on amplitude-based panning, spatiality collapses in low frequencies. Beamforming overcomes this limitation allowing for precise, directional sound beams from bass to trebles.

Ambisonic arrays vs spherical beamforming?
Dome arrays (outside-in) create 3D soundfields via speaker rings toward a central listener — sweet-spot limited, venue-scale. Spherical beamformers (Slovox, IKO) project precise beams outward from single units, using room as medium — mobile, no fixed position needed, public explorable.
Ambisonics vs surround sound?
Surround (5.1, 7.1 etc…) assigns fixed channels to speaker positions — horizontal ring, channel-based. Ambisonics captures full-sphere soundfield mathematically, decodes flexibly to any speaker layout (including height). Slovox Watermelons handle both (assuming transcoding), plus beamforming control beyond either.
Ambisonics vs Dolby Atmos?
Ambisonics encodes full-sphere soundfield for flexible loudspeaker decoding. Atmos uses object-based audio (128 tracks max) with fixed speaker beds + height channels — cinema/home optimized, limited to upper hemisphere. Slovox supports ambisonic workflows, plus HOA beamforming Atmos can't match.
Is beamforming better than ambisonics?
Not better — complementary. Ambisonics represent captured soundfields. Beamforming steers focused sound sources anywhere in space across wide frequency range (200Hz-20kHz), except for sub-bass, which is inherently omnidirectional. Slovox Watermelons decode HOA and beamform.
Spherical beamforming vs Holoplot beamforming?
Spherical beamforming arrays (pioneered by IEM in Graz with IKO/393) use ambisonics and spherical harmonics to form focused sound beams. Used primarily in research and art practice.

Holoplot's beamforming relies on different concepts, including phase shifting to create sound fields. It scales commercial Matrix Arrays (1,000+ drivers) for stadiums or objects like The Sphere in Las Vegas — venue-sized infrastructure.

Slovox brings IEM math to a new breed of portable instruments and wider audiences via Immersive SoundPods
IEM IKO/393 vs Slovox arrays?
IKO is the pioneering beamforming array developed at IEM including 20x 6" drivers, reaching 3rd (or 4th with mixed-order control) ambisonic resolution, and built in small quantities since ~2018, primarily for research centers.
 
393 (15x 2.5" drivers) is a follow-up student project at IEM developed by Stefan Riedel, aimed to increase resolution via mixed-order harmonics and shrink form factor. Used primarily by enthusiasts and artists. 
 
Slovox' 393 "The Rebel" pays a tribute to Stefan Riedel's original design, while bringing several improvements. It's our most compact and affordable array, already available for purchase.
 
Original Slovox arrays (Singing Watermelons) are a independent, parametrically designed family, ranging from 15 to 24+ drivers, matching or surpassing IKO's spatial resolution (up to 16 drivers in the horizontal plane vs IKO's 10 and 393's 9).
Do I need acoustic treatment?
No — Watermelons thrive in untreated spaces. Unlike dome arrays, they project beams that interact with room geometry, creating evolving sculptures. Dead rooms diminish this; we optimize placement for your venue.
Room acoustics for beamforming arrays?
Moderately live rooms (RT60 0.5-1.5s) optimize beamforming. Watermelons project outward, using architecture as co-creator — dry studios kill spatial effects, halls and cathedrals blur imaging. No acoustic treatment needed. For large rooms (100 sqm+) it is advised to use walls strategically, or use sound reflectors (baffles).
Software workflow for Slovox instruments?
Beamforming: Reaper + ambisonic suite of your choice (for example IEM plugins) to encode to HOA and spatialize, Slovox plugins for decoding. Alternatively IRCAM SPAT~ for advanced use. Ableton Live with XP4Live can work, but capped at 3rd order ambisonics. For multi-channel: any DAW works.
 
Book a studio visit for a full workflow.

Slovox

Slovox designs and builds spatial sound instruments, systems, and installations — grounded in the art and science of listening. 

The Last Ear

We are the R&D lab of The Last Ear, a platform dedicated to restoring attentive listening in an age of distraction.

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