Bedrock STIPAmeter SM50

STIPA has become the industry standard for measuring the Speech Transmission Index.  The Bedrock STIPAmeter is the device that many have been waiting for: finally a STIPA meter that is accurate, reliable and affordable at the same time! Designed from scratch by the very team that invented STIPA and was responsible for the development of the Speech Transmission Index for the last few decades.

The SM50, with its full-coulour touch screen, is easy to use and understand even to first-time users of to the Speech Transmission Index. The casual STI user will not have to deal with impossible key combinations, incredibly complex calibration procedures and other discomforts that people have come to expect from STI measuring tools. To the contrary: the SM50 is easy to use, intuitive and almost plug-and-play. At the same time, even seasoned STI experts will find every feature they ever wanted.

The SM50 was designed from the ground up by the inventors of STIPA, and is a fully compliant Speech Transmission Index measuring device as specified in IEC-60268-16 4th ed. (2011). It offers two measuring modes: a quick screening mode, optimized for ease of use and for quick use, and a "Pro" mode that offers the most complete and versatile functionality of any Speech Transmission Index measurement to date.


  • STIPA measuring (quick screening mode, pro mode)
  • Type 2 / class 2 Sound Level Meter (fast, slow, A/C.Z-weighting, Leq)
  • Real Time Analyzer (1/3 and 1/1 octave) - available after free firmware upgrade early 2014
  • FFT analyzer - available after free firmware upgrade early 2014

Technical specifications

  • 20 - 20.000 Hz frequency range
  • Dynamic range 30-130 dB (with supplied microphone)
  • Full-colour resistive LCD touch screen (240x230 px)
  • 4 GB of storage (of which at least 95% available for user data)
  • Access to stored data through USB
  • Integrated long-life batterypack, rechargeable via USB
  • Complies with IEC 60268-16 rev. 4, IEC 61672 Class 2, ANSI S1.4 Type 2

The Bedrock STIPAmeter SM50 can be bought directly from our webshop. The SM50 is shipped worldwide with our global 24-month pick-up and return warranty.