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Thickness of Plane Wave in Air Cavity (MPP) with Backing

This measurement study investigates the thickness of a plane wave in an air cavity with Multi-Purpose Panel (MPP) and backing material. The study analyzes different thicknesses, partition spacings, and the effect of porosity using expanded metal.

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Thickness of Plane Wave in Air Cavity (MPP) with Backing

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  1. Thickness Thickness 0.89 mm 3.75 mm

  2. 1 2 3 d Plane Wave Air Cavity p2 v2 p1 v1 t D

  3. 1 2 Plane Wave … n

  4. 0.5 in. 2 in. 4 in. Measurement not valid above 1800 Hz

  5. MPP s s s d1 d2 d3 d4 MPP is laid on top of backing. l a. b.

  6. MPP MPP MPP is laid on top of backing. l2 d2 d1 l1 S2 S1 c c. a. b.

  7. b a MPP is laid on top of backing. a. b.

  8. a. b.

  9. Source Room 6 in Partitions MPP 12 in 6 in 12 in 72 in 16 in 20 in 72in 12 in Partition Spacings

  10. MPP MPP 2, 4, or 8 inches a. b. c.

  11. MPP (small porosity) Expanded Metal with Large Porosity

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