What is STIPA Testing?

STIPA (Speech Transmission Index for Public Address) testing is a method used to evaluate the clarity and intelligibility of speech in a given environment. It is essential for ensuring that public address (PA) systems deliver clear and understandable speech to all listeners, regardless of their position in the room or space.

STIPA testing involves the use of a standard test signal, the STIPA test signal, which is played through the PA system. This signal is then measured at various positions throughout the environment to assess the quality of the sound signal as it reaches each measurement location.

How Does STIPA Testing Work?

The test measures the Speech Transmission Index (STI), which quantifies how easily speech can be understood. The STI is calculated by comparing the original test signal with the signal received at each measurement point. The resulting intelligibility score is expressed as a single number ranging from 0 to 1, with:

  • 0 indicating unintelligible speech
  • 1 indicating excellent intelligibility

The standard for STI measurement is defined in the IEC 60268-16 standard for Speech Transmission Index. This provides a framework for assessing any degradation in the signal and ensuring that the results are accurate and consistent.

The intelligibility result is typically displayed as an STI or CIS (Common Intelligibility Scale) value. A higher STI value indicates better clarity, while a lower STI value suggests issues with intelligibility, which may need to be addressed.

Why Choose ICAN Acoustics for STIPA Testing?

At ICAN Acoustics, we ensure that all STIPA tests are conducted in accordance with the latest international standards, including IEC 60268-16. Our experienced professionals utilize state-of-the-art equipment to carry out accurate and reliable measurements, providing you with clear, actionable data about the performance of your public address system.

We are committed to delivering results that help you achieve the highest possible levels of speech intelligibility in your environment. Whether you are designing a new PA system or optimizing an existing one, our STIPA testing services provide the insights you need to ensure optimal performance.

Our STIPA Testing Process:

  1. Site Survey: Our team will perform a thorough site survey to understand the acoustics and layout of the space.
  2. STIPA Signal Testing: Using calibrated measurement tools, we will play the STIPA test signal and record the results at multiple locations.
  3. Data Analysis: We will analyze the collected data according to the IEC 60268-16 standard to determine the STI and intelligibility score.
  4. Comprehensive Report: You’ll receive a detailed report highlighting the intelligibility of your PA system, with recommendations for improvements if necessary.

By choosing ICAN Acoustics, you can be confident that your STIPA testing is done accurately and professionally, ensuring the best possible performance of your PA system and providing a more intelligible listening experience for your audience.

Get in Touch

If you’re interested in STIPA testing for your public address system, contact us today! Our team is ready to assist you in ensuring that your PA system meets the latest standards for speech intelligibility.


Dublin: 01-4403869

Galway: 091-588555

Cork: 021-2031287

Mobile: 087-8137058

UK: 0161-660-1611

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