Products

MEMS Microspeakers and Dynamic Vents

Montara

The World’s First True MEMS Full Range Microspeaker

Cowell

The World’s Smallest MEMS Microspeaker

Montara Plus

The World’s Highest Sensitivity MEMS Microspeaker

Skyline

World’s First Solid-State MEMS DynamicVent For Active Ambient Control

Cypress

The World’s First 140 dB Full-Range, Solid-State MEMS Speaker for ANC Earbuds

Features

xMEMS’ solid-state MEMS Microspeaker delivers a new level of performance, size, energy efficiency and uniformity not possible with traditional voice coil speakers through the combination of design innovation and monolithic capacitive piezo-MEMS manufacturing.

Sound Quality
  • Montara, Cowell, and Montara Plus:
    • Full bandwidth (20Hz-20kHz) with flat frequency response for occluded applications
    • High performance tweeter or midrange-tweeter for open/leaky applications
  • Cypress:
    • Full bandwidth (20Hz-20kHz) for ANC earbuds
  • +/-1° phase consistency for improved spatial audio performance
  • No in-band resonances
  • Superior high-frequency response vs. coil speakers improves:
    • Clarity
    • Presence
    • Speech-in-noise performance for hearing health applications
  • 0.5% THD (94dB @ 1kHz)
  • Better SPL/mm3
Robustness
  • Monolithic piezoMEMS 10,000g mechanical shock resistance
Consistency
  • Highly uniform frequency response and phase
  • Reliable semiconductor process (JEDEC-qualified)
  • Eliminates driver matching and calibration
Longer listen times
  • Capacitive vs. current-driven architecture reduces driver power consumption
Water-proof
  • IP58 water immersion and dust resistance without special membrane
Precise Transduction
  • Monolithic design eliminates spring and suspension recovery of coil-based speakers
  • Fast mechanical response (<50μs group delay) enables improved ANC bandwidth of nonstationary noise
  • Near-zero phase delay increases maximum noise suppression bandwidth of stationary noise
Implementation
  • World’s First SMT-ready microspeaker
  • Companion piezo amplifier IC (xMEMS Aptos)
Small size
  • 1mm thickness
  • More space for larger batteries or more components
  • Top or Side-firing package orientations

Montara 

The World’s First True MEMS Full Range Micro Speaker (In Production)

Applications

TWS

Wired Earphones

Hearing Aids

Specifications

Montara + Aptos
Acoustic Performance (IEC 60318-4 Coupler)
SPL @ 1kHz / 30Vpp115dB
THD @ 1KHz/94dB SPL0.5%
Package DimensionsMontara Top Firing: 6.05W x 8.4L x 1.15H (mm)
Montara Side Firing: 6.05W x 1.15H x 8.4L (mm)
Aptos Amplifier: 1.92 x 1.92 x 0.6 (mm) WLCSP

Cowell

The World’s Smallest True MEMS Full Range Micro Speaker (In Production)

Device
2-way Speaker Module
(DD Woofer + Cowell Tweeter)

Applications

TWS

Wired Earphones

Hearing Aids

Specifications

Cowell + Aptos
Acoustic Performance (IEC 60318-4 Coupler)
SPL @ 1kHz / 30Vpp
SPL @ 2kHz / 30Vpp
111dB
116dB
THD @ 1KHz/94dB SPL0.5%
Package DimensionsCowell Side Firing: 3.2W x 1.15H x 6.0L (mm)
Cowell Top Firing: 3.2W x 6.0L x 1.15H (mm)
Aptos Amplifier: 1.92 x 1.92 x 0.6 (mm) WLCSP

Montara Plus

The World’s Highest Sensitivity MEMS Micro Speaker (In Production)

Full Range Applications
TWS

Wired Earphones

Midrange-Tweeter Applications
Smart Glasses

Virtual Reality

Loudspeaker Tweeter Arrays

Specifications

Montara Plus + Aptos
Acoustic Performance (IEC 60318-4 Coupler)
SPL @ 200Hz / 30Vpp
SPL @ 2kHz / 30Vpp
120dB
127dB
THD @ 1KHz/94dB SPL0.5%
Acoustic Performance (Free Field @ 3cm)
SPL @ 2kHz / 20Vpp
SPL @ 4kHz / 20Vpp
SPL @ 10kHz / 20Vpp
79dB
90dB
108dB
Package DimensionsMontara Plus Top Firing: 5.15 x 10.8 x 1.15 (mm)
Montara Plus Side Firing: 5.15 x 1.15 x 10.8 (mm)
Aptos Amplifier: 1.92 x 1.92 x 0.6 (mm) WLCSP

Skyline

World’s First Solid-State MEMS DynamicVent for Active Ambient Control (Now Sampling)

Applications

TWS

Wired Earphones

Hearing Aids

Specifications

Skyline + Alpine (Driver IC)
Low Frequency Roll-off @ 100Hz (IEC 60318-4 Coupler)26dB
Acoustic Impedance (kg/(m4s))650K (vent open)
1G (vent sealed)
Equivalent Vent Diameter (mm)
(Assumes 8mm vent length)
0.98 mm
Package Dimensions 1.19W x 1.72L x 0.55H mm

Skyline DynamicVent – Active Ambient Control

Skyline Vent Closed
  • Eliminate low frequency roll-off
    • Best music experience
    • Best bass response
  • Superior passive isolation
    • Improved focus
    • Better hearing protection
icon_dsp
DSP controls seal or leak based on:
  1. user input; or
  2. sensor fusion
    • Mic
    • Accelerometer
    • Pressure/Altitude
    • Proximity
Skyline Vent Open
  • Adjustable attenuation (up to 25dB @ 100Hz)
  • Ambient passthrough
  • Spatial awareness
  • Reduced occlusion effects
    • Self-voice
    • Footsteps
  • Ear pressure relief

Cypress

The World’s First 140 dB Full-Range, Solid-State MEMS Microspeaker for ANC Earbuds

Applications

TWS

Specifications

Cypress + Alta
Acoustic Performance
SPL @20Hz143dB
THD @1kHz / 111 dB SPL< 0.5%
Package Dimensions6.5 x 6.3 x 1.65 (mm)
9mm diagonal

Sound from Ultrasound – Cypress MEMS Microspeaker

Features
  • Extended ANC bandwidth with enhanced speed and phase consistency
  • Next-level phase coherency for spatial audio
  • Hi-Res Audio with superior detail & separation
  • Enhanced speech clarity
  • No in-band mechanical movement for low distortion

 Operation Principle System Level Alta + Cypress

Alta Controller
  • Companion chip for Cypress
  • Modulates carrier signal with audio signal
  • Generates carrier (Sm) and synchronized demodulation signal (Sv) for Cypress
Cypress MEMS Microspeaker
  • Pressure modulator and demodulator
  • Membrane(s), driven by Sm produces ultrasonic modulated pressure in chamber
  • Valves (Sv) are driven to demodulate ultrasonic pressures, generating pulses
  • Audio signal is generated with high fidelity from envelope of pulses