For more than a decade, the Bedrock BTB65 TalkBox has been a trusted tool for professionals performing speech intelligibility testing on fire alarm and voice evacuation systems. Since its introduction, it has helped simplify acoustic measurements by providing a calibrated, reliable sound source right out of the box.

After 12 successful years in the field, the Bedrock BTB65 TalkBox is being phased out and replaced by the new BTB115 Advanced TalkBox. Designed for today’s speech intelligibility testing requirements, the BTB115 builds on everything users appreciated about the BTB65 while adding powerful new capabilities that improve flexibility, connectivity, and ease of use.

Why Use a TalkBox?

Speech intelligibility testing depends on a consistent, calibrated sound source. Rather than assembling and calibrating multiple components before every test, a TalkBox provides a ready-to-use solution that delivers accurate, repeatable results.

Whether you’re performing STIPA or Full STI testing, verifying voice evacuation systems, or conducting frequency response measurements, the BTB115 is designed to simplify the testing process.

What’s New with the BTB115?

The BTB115 retains all the proven functionality of the BTB65 while introducing several significant enhancements, including:

• WiFi and Bluetooth connectivity
• Up to 4–6 hours of battery operation
• USB-C storage for custom test signals
• Integrated calibrated laser rangefinder
• XLR line-in and line-out connections
• Front and rear touch displays
• Modern, ergonomic design with an integrated carrying handle

Together, these upgrades make setup faster, improve measurement accuracy, and provide greater flexibility in the field.

Built for Speech Intelligibility Testing

The BTB115 supports a wide range of testing applications, including:

• STIPA testing (IEC 60268-16 Rev. 4 & Rev. 5)
• Full STI signal playback
• Pink noise, white noise, sine waves, and frequency sweeps
• Playback of user-defined calibrated audio files
• Calibrated speech samples in multiple languages
• Automatic calibration of playback level and spectrum
• User calibration for alternative reference distances, planes, and angles

An integrated laser distance meter automatically calculates the sound pressure level at the microphone position, helping ensure accurate microphone placement during every test.

Learn More

Whether you’re upgrading from a BTB65 or purchasing your first TalkBox, the BTB115 provides a complete solution for accurate, repeatable speech intelligibility testing.

Contact SDi to learn more about the BTB115 or to request pricing and availability.