Research and education
Learn at your own pace.
A practical introduction to frequency-related technologies, their differences, and the questions worth asking.
How the systems differ
Understand the distinction between delivery methods and equipment architectures.
Explore architecture →Research library
Explore terminology, research questions and supporting context.
Open library →Exploring your options
For visitors and families navigating difficult decisions.
Read the guide →Sound is not the same as electromagnetic output
Two devices may both advertise a frequency in hertz while using entirely different delivery methods. Compare the actual output, exposure and measurement method—not only the number on a screen.