Hearing instrument

  • Complete range of configuration options
  • Wide range of size and performance options
  • Custom crafted designs

Knowles' continues to drive the design and development of new microphone solutions for hearing aids. Developments include unidirectional, omni-directional, matched pairs, and combined uni-omni microphone designs. Behind-the-ear, in-the-ear,in-the-canal, completely in-the-canal, and new cochlear completely in-the-ear solutions are refined through variables such as shell size, RFI suppression, sound damping, port configuration, frequency response, shock resistance and more.

Select a product category to view features, benefits, documents and performance details

Image Series Dimensions Features
EA series EA series 5.56mm x 3.98mm x 2.21mm (.219in x .157in x .087in)
  • Rugged construction to withstand severe environmental conditions
  • High resistance to mechanical shock
  • Available with RFI suppression
  • Undamped, screen damped, and internally damped responses
  • Numerous port locations
  • Custom tube diameters and lengths available
  • Wide range of frequency responses
EK/EY series EK/EY series 5.56mm x 3.98mm x 2.21mm (.219in x .157in x .087in)
  • Rugged construction to withstand severe environmental conditions
  • High resistance to mechanical shock
  • Available with RFI suppression
  • Undamped, screen damped, and internally damped responses
  • Numerous port locations
  • Custom tube diameters and lengths available
  • Wide range of frequency responses
EL series EL series 4.00mm x 5.59mm x 2.28mm (.157in x .220in x .090in)
  • Unidirectional
  • Integral FET amplifier
  • High electroacoustical sensitivity
  • Low vibration sensitivity
  • Low noise
  • Cardioid and supercardioid responses
  • High rejection of noise from side and rear
EM/BEM series EM/BEM series 3.61mm x 3.61mm x 2.21mm (.142in x .142in x .087in)
  • Rugged construction to withstand severe environmental conditions
  • High resistance to mechanical shock
  • Improved RFI and EMI
  • Undamped, screen damped, and internally damped responses
  • Numerous port locations and a wide range of frequency responses available
  • Extended housing EM microphones are also available, improving sensitivity/noise in the same footprint
  • Custom corner frequencies achieved through electrical high pass filter optimize noise performance at low frequencies for demanding matching and directional applications
  • BEM offers improved Power Feedthrough Attenuation, improved settling time, and electrical high pass filter
FG/BFG series FG/BFG series 2.59mm dia. x 2.59 mm (0.102in dia. x 0.102in)
  • Small size is ideal for multiple applications
  • Rugged
  • High resistance to mechanical shock
  • Exceptionally low vibration sensitivity
  • Various responses available
  • Integral RFI suppression
  • BFG offers improved Power Feedthrough Attenuation, improved settling time, and electrical high pass filter
  • Custom corner frequencies achieved through electrical high pass filter optimize noise performance at low frequencies for demanding matching and directional applications
MQM series MQM series 3.35mm x 2.50mm x 0.96mm (.131in x .098in x .038in)
  • Reflow soldering compatible
  • Low vibration sensitivity
  • Bottom port PCB mount or traditional tubed options
  • Smallest MEMs hearing instrument microphone available
QM series QM series 4.00mm x 3.00mm x 1.17mm (.157in x .118in x .046in)
  • Reflow soldering compatible
  • Low vibration sensitivity
  • Bottom port PCB mount or traditional tubed options
  • Highest SNR MEMs hearing instrument microphone available
TD series TD series 3.61mm x 3.61mm x 1.30mm (.142in x .142in x .051in)
  • For Power BTE, Standard BTE, Full-shell ITE, and Half-shell ITE applications
  • Improved RFI and EMI suppression
  • Two port configuration
  • Various port locations
  •  Custom tube diameters and lengths available
TM/BTM series TM/BTM series 3.61mm x 3.61mm x 1.30mm (.142in x .142in x .051in)
  • Rugged construction to withstand severe environmental conditions
  • High resistance to mechanical shock
  • Improved RFI and EMI suppression
  • Undamped, screen damped, and internally damped responses
  • Numerous port locations and a wide range of frequency responses available
  • Extended housing TM microphones also available improving sensitivity/noise in the same footprint
  • Custom corner frequencies achieved through an electrical high pass filter optimize noise performance at low frequencies for demanding matching and directional applications
  • BTM offers improved Power Feedthrough Attenuation, improved settling time, and an electrical high pass filter
TO/BTO series TO/BTO series 3.61mm x 3.61mm x 1.30mm (.142in x .142in x .051in)
  • Improved RFI and EMI suppression
  • Undamped, screen damped, and internally damped responses
  • Numerous port locations
  • Custom tube diameters and lengths available
  • Custom corner frequencies achieved through an electrical high pass filter optimizes noise performance at low frequencies for demanding matching and directional applications
  • BTO offers improved Power Feedthrough Attenuation, improved settling time, and an electrical high pass filter
TP series TP series 3.61mm x 3.61mm x 2.59mm (.142in x .142in x .103in)
  • Only four lead wire connections needed
  • Improved RFI and EMI suppression
  • Two port configuration
  • Various port locations
  • Custom tube diameters and lengths available