Products

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 micro speakers deliver 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)21.5dB (Single Skyline)
25dB (Dual Skyline)
Acoustic Impedance (kg/(m4s))540k (vent open)
3.7G (vent sealed)
Equivalent Vent Diameter (mm)
(Assumes 1mm vent length)
1.1 mm (Single Skyline)
1.3 mm (Dual Skyline)
Package DimensionsSkyline: 4.0W x 5.0L x 1.15H (mm)
Alpine single channel: 1.0W x 1.2L x 0.6 (mm)
Alpine dual channel: 1.5W x 1.8L x 0.6 (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 Micro Speaker 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 Micro Speaker

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 Speaker
  • 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