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Reverberation is the persistence of sound in an enclosed space after the sound's source has stopped. The estimation of a room's reverberation time (RT60) is a fundamental calculation in acoustics to determine perceived liveliness. Both the Sabine and Eyring equations are traditional models and assume the absorptive surfaces are evenly distributed across all walls, floor, and ceiling. The Fitzroy model accounts for uneven distribution across adjacent surfaces.

Enter the room dimensions at RT goal in the fields below. The Suggested RT By Application tab can help determine an appropriate RT goal based on your room's geometric volume. Use the RT Multiplier or RT Goal fields at right to further refine your goal. Enter all room surfaces and audience areas in the sections below. Select absorptive surfaces until the RT graph satisfies the RT goal, or once all present surfaces are entered use the Suggested Finishes tab to select finishes that are absorptive at frequencies where the RT goal exceedance remain.

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RT GOAL AND RESULTS

125 250 500 1000 2000 4000
RT Goal, s 0.0 0.0 0.0 0.0 0.0 0.0
Sabine, s
           
Eyring-Norris, s
           
Fitzroy (Sabine), s
           
Fitzroy (Eyring), s
           
Arau-Puchades, s
           
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ADVANCED RT GOAL SETTINGS

125 250 500 1000 2000 4000
RT Multiplier
RT Goal, s
RT Upper Bound, %
RT Lower Bound, %
Sabin Goal            
SabinsAir            
α            

SUGGESTED RT BY APPLICATION

  • 0.0 s

    Auditorium for Speech

  • 0.0 s

    Recording Studio

  • 0.0 s

    Television Studio

  • 0.0 - 0.0 s

    Church

    Speech

  • 0.0 - 0.0 s

    Church

    Music

  • 0.0 - 0.0 s

    Opera/Chamber Hall

  • 0.0 - 0.0 s

    Symphony Hall

SABINE DETAILS

Calculated            
Needed            

EYRING-NORRIS DETAILS

Calculated            
Needed            

FITZROY DETAILS (SABINE COEFFICIENTS)

Sidewalls
           
           
Front/Rear
           
           
Floor/Ceiling
           
           

FITZROY DETAILS (EYRING COEFFICIENTS)

Sidewalls
           
           
Front/Rear
           
           
Floor/Ceiling
           
           

ARAU-PRUCHADES DETAILS

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Sabins are same as in Fitzroy details with Eyring coefficients above. Arau defines three energy decays (early, middle and late) of which this is the middle.

Sidewalls
           
Front/Rear
           
Floor/Ceiling
           
FT

ROOM PROPERTIES

Length,ft   Sidewalls,ft2   Room Volume,ft3  
Width,ft   Front/Rear,ft2     Mean Free Path,ft    
Height,ft   Floor/Ceiling,ft2    
RT Goal, s   Total Area,ft2          
ADD

ROOM SURFACES

ADD

AUDIENCE AREAS

SUGGESTED FINISHES NEW!

     
  • Enter room dimensions, an RT goal and at least one finish to view suggested finishes.