RPG FlutterFree Absorption Details

Independent Acoustics and Noise Control Specialists

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RPG FlutterFree Absorption Coefficients
Using slotted Flutterfree Strips

The absorption coefficient data was measured without any spacing between the FlutterFree planks. 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). For extended low frequency absorption the FlutterFree Helmholtz mounting may be used in conjunction with the slotted planks.

Mount:	Surface	Cavity
Slot Width	6.35mm	6.35mm
Slot Spacing	28.6mm	28.6mm
FlutterFree Width	25mm	25mm
FlutterFree Thickness	25mm	25mm
Backing	25mm acoustic mineral wool	25mm acoustic mineral wool
Cavity Depth	0	89mm
Total Thickness	51mm	140mm
Hz	Absorption Coefficient
100	0.10	0.35
125	0.08	0.41
160	0.14	0.43
200	0.21	0.60
250	0.32	0.77
315	0.62	0.97
400	0.85	1.01
500	1.17	0.91
630	1.09	0.83
800	0.81	0.71
1000	0.58	0.61
1250	0.45	0.55
1600	0.38	0.50
2000	0.34	0.42
2500	0.32	0.38
3150	0.33	0.38
4000	0.43	0.44
5000	0.48	0.49

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All information contained in these details is given in good faith but without warranty.
Custom Audio Designs reserves the right to alter the specifications of any product without notice.

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