Quality assurance

Our proven track record of quality excellence gives you confidence that we can consistently provide dependable products.

In the 1960s, the Apollo 11 astronauts wore our BA/BB microphone and receiver headsets when they landed on the moon, establishing Knowles as a company known for quality. In the 1990s, the Knowles EK-3132 microphone was used for the Mars Polar Lander. Our heritage continues as NASA, medical technology companies and others continue to turn to Knowles’ acoustic solutions.

With our Quality Management System, we can ensure design integrity, efficient manufacturing and cost effective on-time delivery. Based on ISO-9001 standards and Six Sigma principles, we drive constant enhancements in our processes – focusing on long-term improvement as a means to achieve flawless execution.

We recognize that your work is what matters most to you so our manufacturing facilities follow a disciplined approach to quality assurance including:

  • Tools for process development
  • Failure Mode and Effects Analysis (FMEA)
  • Control Plans
  • Statistical process controls
  • One hundred percent functional testing of transducers
  • Operator training and certification programs
  • In-process audits
  • Ongoing reliability testing (for process validation)

We also perform comprehensive product performance testing to ensure our devices have the ability to withstand extreme conditions and environments. 

Conflict Materials

Through the “Stage Gate” process we develop and qualify new products with quality assurance at the core. With you, we address each of your vital concerns and engage the perspectives of marketing, engineering, manufacturing — helping bring your ideas to market with greater speed and confidence.


Our Global Customer Response System tracks progress on product evaluations. With real-time updates available for all projects, the system supports development programs as well as yield and customer issues.

We employ a comprehensive array of the latest analytical equipment including Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscope (SEM), EDX and X-Ray imaging technologies as a value-added option.  

Fourier Transform Infrared Spectroscopy (FTIR)

Customer Response Support

Customer Response Support

Scanning Electron Microscope (SEM)

Customer Response Support

Customer Response Support

Ionizing Radiation Imaging (X-RAY)

Customer Response Support

Customer Response Support

Excellent suppliers are critical to producing quality products. Our Supply Management and Supplier Quality teams collaborate closely on the qualification of new suppliers. Our suppliers’ performance is monitored regularly through scorecards and performance reviews.
  Knowles Policy Supplier Requirements
Quality Mgmt System Quality Policy Supplier Quality Manual
Material Compliance Environmental Compliance Hazardous Substance Free Handbook
Environmental, Health & Safety EHS Policy Supplier Code of Conduct
Code of Conduct Code of Conduct
Conflict Minerals Conflict Minerals Policy Conflict Minerals Overview
Customs-Trade C-TPAT Customs Security

Quality Management System

All Knowles' facilities are certified to the ISO-9001 Standard.


Environmental Management System

All Knowles' manufacturing facilities are certified to the ISO-14001 Standard.


Occupational Health and Safety Management System

All Knowles' manufacturing facilities are certified to the OHSAS-18001 Standard.