01 / Identity

Five transducers per ear. One acoustic system.

Voix 4 develops the architecture of Metal MEMS-422 around the Voix acoustic system. Three discrete MEMS speakers — xMEMS Montara, xMEMS Muir and USound Conamara — share each earpiece with two dynamic drivers.

Each driver has its own range. Muir works inside the Voix resonator; Montara and Conamara each cover the full range. The aim is not more MEMS, but more specialized MEMS in one acoustic system.

Per ear: 5 transducers
MEMS speakers: 3
Voix region: 1.5–2.5 kHz
Successor to: Metal MEMS-422
Fit: 50+ real ear impressions
Energizer: AP GO included

02 / Sound + Voix

Where speech lives, the system works hardest.

Voix does not recreate open-ear resonance. It changes how the driver is acoustically configured in the 1.5–2.5 kHz region, where voices carry most of their information. Muir’s own 12.2 kHz mechanical resonance is not shifted.

Pitch / fundamental energyVoix region 1.5–2.5 kHzAir / harmonics

MEMS-Voix 4 - Frequency-response graph, NEW — ARTA measurement, MEMS-Voix 4. Unaltered graph.

MEMS-Voix 4 burst decay: New measurement — Time-domain behavior around the Voix region. Does not by itself prove subjective preference.

MEMS-Voix 4 burst decay: Previous measurement — Time-domain behavior around the Voix region. Does not by itself prove subjective preference.

Render of the Voix acoustic assembly: the xMEMS Muir driver coupled to a tuned chamber.

03 / Configuration

Three MEMS speakers, each with a different job.

xMEMS Muir — mid-range, inside the Voix resonator1×
xMEMS Montara — full-range1×
USound Conamara — full-range1×
6 mm dynamic — mid-range1×
10 mm dynamic — sub-bass1×

Illustrative simulation, not to scale.

xMEMS Montara

Six cells. One silicon die.

Montara is built differently even by MEMS standards. Six individual piezoMEMS speaker cells are fabricated into one monolithic silicon transducer and move together as a single acoustic source. In Voix 4 it works as a full-range driver alongside Muir and Conamara.

Monolithic silicon · 6 speaker cells · 1 acoustic output

3 MEMS

in each ear.

Montara · Muir · Conamara

To our knowledge, the first commercially announced IEM integrating three discrete MEMS speakers per earpiece.

MEMS-Voix 4 - xMEMS Montara photo — xMEMS Montara
Full-range. Six piezoMEMS cells on one monolithic silicon die. [COPY TO CONFIRM]

MEMS-Voix 4 - xMEMS Muir photo — xMEMS Muir
Mid-range, inside the Voix resonator. [COPY TO CONFIRM]

MEMS-Voix 4 - USound Conamara photo — USound Conamara
Full-range. [COPY TO CONFIRM]

04 / Form

Shaped from real ears.

Shell geometry comes from more than 50 pairs of real ear impressions, so the nozzle angle and body sit where ears actually are.

Voix 4 is the more demanding fit problem: five transducers, three MEMS architectures and the Voix acoustic chamber must coexist inside the available shell volume without letting internal complexity dictate the external fit.

MEMS-Voix 4 - Shaped from real ears: photo 1

MEMS-Voix 4 - Shaped from real ears: photo 2

MEMS-Voix 4 - Shaped from real ears: photo 3

[ASSET REQUIRED]
Ear-impression
overlay / fit photo

05 / Use · AP GO energizer

Included: AP GO.

A pocket-sized energizer with regulated DC bias of 9 V or more, driving Muir within its signal range. Plug in, listen.

Regulated DC bias≥ 9 V
Signal handlingup to 24 Vpp
FormPocket-sized

[ASSET REQUIRED]
AP GO product photo
(AP GO 2 is not included)

Specifications

MEMS-Voix 4 in detail.

Drivers per ear: 1 Montara · 1 Muir · 1 Conamara · 1 × 10 mm & 1 × 6 mm dynamic
Transducers per ear: 5
MEMS speakers per ear: 3
Voix region: 1.5–2.5 kHz (mode ≈ 1.8 kHz)
Connector: 2-pin 0.78mm
Cable: 4.4mm
Shell: Half Stainless Steel, Half Resin
Included energizer: AP GO
Warranty: 1 year

Also in the Voix family

MEMS-Voix 3 — MEMS-3S 2025, evolved.

View Voix 3 →