What is RT60?
RT60 is the reverberation-time metric representing how long sound level in a room takes to decay by 60 decibels after the source stops, measured or extrapolated under defined conditions.
How RT60 works in a connected system
RT60 describes acoustic decay, usually by frequency band rather than as one universal value. A full 60-decibel decay may be difficult to capture above background noise, so measurements often use a shorter decay range and extrapolate, producing related values such as T20 or T30. Early decay time uses an earlier portion and can relate differently to perception. Results depend on source and microphone positions, room state, background noise, excitation method, and whether the sound field is sufficiently diffuse for the method. A target should reflect room volume and use: speech, cinema, music, and mixed-purpose spaces do not require identical decay. Balanced decay across relevant frequencies is often more informative than chasing one extremely low number.
Why RT60 matters in Scottsdale projects
RT60 measurements in a Scottsdale, Arizona room should document whether shades, doors, furnishings, and seating were present during the test. A tall great room can behave differently when occupied, while an open doorway may prevent decay from acting like a simple enclosed-room model.
Planning and installation considerations
- Choose a measurement method suited to room type and noise floor, then record source, microphone, furnishing, door, shade, seating, and HVAC conditions.
- Review decay in relevant frequency bands and at multiple positions rather than relying on one broadband average or one convenient microphone location.
- Set target behavior from room use and volume, then model or iteratively add absorption, bass control, diffusion, and furnishings while re-measuring balance.
A common point of confusion
RT60 is not a universal acoustic quality score. Two rooms with the same average value can sound different because decay varies by frequency and position, early reflections differ, noise masks detail, and one room contains discrete echoes or modes.
Frequently asked questions
Why is RT60 sometimes extrapolated?
Many ordinary rooms do not provide a clean measured decay of the full 60 decibels before reaching the background-noise floor. Standardized methods can measure a shorter, reliable slope and extrapolate the equivalent 60-decibel time.
What RT60 should a home theater have?
There is no single number for every theater. Room volume, frequency, seating, speaker behavior, standards or design goals, and desired listening character matter. Consistent decay and controlled reflections are considered alongside the chosen target range.
About this definition
Camelback Smart Homes publishes this glossary for homeowners, design professionals, builders and business teams comparing integrated technology. We separate general concepts from project-specific recommendations and check changing product or protocol details against first-party documentation when appropriate.
Actual system requirements depend on construction, wiring, network conditions, equipment versions, environmental exposure and the goals of the people using the space.