Montara Series

The World’s First True MEMS Full Range Microspeaker


Montara, the industry’s first monolithic True MEMS speaker, eclipses early hybrid-MEMS speakers by implementing the entire speaker (actuator and membrane) in silicon, reducing package height and eliminating driver matching and calibration due to inherent variability in traditional membrane assembly.

Through the combination of design innovation and monolithic capacitive piezo-MEMS manufacturing, Montara delivers a new level of performance, size, energy efficiency and uniformity not possible with traditional voice coil or hybrid MEMS approaches.

Sound Quality
  • Full bandwidth (20Hz-20kHz) with flat frequency response >113dB SPL (occluded)
  • +/-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
  • Highly uniform frequency response and phase
  • Eliminates driver matching and calibration
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
  • Monolithic piezoMEMS 10,000g mechanical shock resistance
Longer listen times
  • Montara’s capacitive vs. current-driven architecture reduces driver power consumption
  • IP58 water immersion and dust resistance without special mesh or coating
  • World’s First SMT-ready microspeaker
  • Companion piezo amplifier IC (xMEMS Aptos)
Small size
  • 58mm3
  • 1mm thickness
  • More space for larger batteries or more components
  • Top or Side-firing package orientations
  • 6mm ɸ (side-firing)


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



Wired Earphones

Hearing Aids


 Montara + Aptos
Acoustic Performance (IEC 6018-4 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 0.6mm WLCSP