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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.

## RT GOAL AND RESULTS

125 250 500 1000 2000 4000
RT Multiplier
RT Goal, s
Sabine, s

Eyring-Norris, s

Fitzroy (Sabine), s

Fitzroy (Eyring), s

Sabin Goal
SabinsAir
α

• 0.0 s

• 0.0 s

• 0.0 s

• 0.0 - 0.0 s

• 0.0 - 0.0 s

• 0.0 - 0.0 s

• 0.0 - 0.0 s

## 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

×

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

## 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

## SUGGESTED FINISHES NEW!

 Finish Type All Manufacturer All Mount Type All Wall Finishes Only Architectural Finishes Ceiling Finishes Only Impact Resistant Finishes Favor less finish area over better curve fit

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