RPG FlutterFree Absorption Coefficients Using standard non-slotted Flutterfree Strips

The absorption coefficient data is for non-slotted FlutterFree in a Hemlholtz mounting. Surface mount refers to a C mounting with fiberglass on the boundary. The Cavity mount refers to a D mounting with a cavity depth of 3.5" (89 mm). The spacing between FlutterFree strips is 0.063" with a fractional open area of 0.015

Mount:	Surface	Cavity
Slot Width	1.6mm	1.6mm
FlutterFree Width	25mm	25mm
FlutterFree Thickness	25mm	25mm
Backing	25mm acoustic mineral wool	25mm acoustic mineral wool
Cavity Depth	0	89mm
Total Thickness	50mm	140mm
Hz	Absorption Coefficient
100	0.19	0.51
125	0.34	0.76
160	0.44	0.58
200	0.75	0.52
250	0.69	0.4
315	0.47	0.31
400	0.37	0.28
500	0.26	0.23
630	0.22	0.21
800	0.15	0.16
1000	0.12	0.16
1250	0.11	0.15
1600	0.11	0.15
2000	0.14	0.18
2500	0.22	0.24
3150	0.17	0.21
4000	0.16	0.22
5000	0.15	0.18

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