RT60

Reverberation time (RT60) measurement for classrooms, meeting rooms, halls and sound test rooms, with analysis against standards and recommendations for acoustic treatment.

Reverberation time (RT60) is the time it takes for sound in a room to fall by 60 dB after the source stops. Too much reverberation makes speech unclear: in classrooms and meeting rooms people struggle to understand each other, and in test rooms it affects measurement results. How we measure: an omnidirectional (dodecahedron) loudspeaker is placed in the room and RT60 is recorded at several microphone positions, typically 4 to 6 points, with a calibrated sound level analyser. Results are given in 1/3-octave bands following ISO 3382-2:2008, and classrooms are compared with the criteria of ANSI/ASA S12.60. We also measure the background noise in the room. What you receive: a report with RT60 at each point and frequency, average values and charts, a comparison with the recommended values, and practical recommendations such as sound-absorbing wall or ceiling panels. After treatment, we can measure again to verify the improvement.

Key features

Measurement to ISO 3382-2:2008
Omnidirectional (dodecahedron) sound source
4 to 6 measurement points per room
1/3-octave results from 200 Hz to 10 kHz
Comparison with ANSI/ASA S12.60 for classrooms
Before and after verification of acoustic treatment

Specifications

Standard	ISO 3382-2:2008
Classroom criteria	ANSI/ASA S12.60
Sound source	omnidirectional dodecahedron loudspeaker
Analyser	Larson Davis 2900B
Calibrator	Norsonic 1251 (IEC 60942 Class 1)
Frequency range	200 Hz to 10 kHz (1/3 octave)