Produt Description:  1> Grooved acoustic panel is a kind of slit resonance absorption  material which is made from high density  panel with grooves on the surface and perforated holes at the back  side.  2> It has strong selection on the sound spectrum and particular great  performance on the middle and low frequency.  3> It has better sound absorption effect on medium and high frequency  if there is sound absorption cotton filled at the back side cavity..  4> The design can be custom made  5> How to calculate the perforated rate:        1) When the hole line up in square P=0.785*(D/B)m2        2) When the hole line up in Equilateral triangle              P=0.907*(D/B)m2         P ----- Perforated rate(%)         D ----- Diameter of the hole         B ----- Distance between two center of the holes 1>  The grooved acoustic panel is made of high quality MDF board. 2>  According to the customer?s acoustic and decoration requirement, our MDF board can equipped with outstanding environmental, flame retardant and waterproof function, even can with various colors and finish choices. 3>  Our grooved acoustic panel?s highest fire retardant grade can reach A2(GB) grade, and the best environmental protection can reach E1(GB) grade. 4>  Grooved wood acoustic panel structures? finish including: Melamine, Natural veneer, Anti-fire plate, Paint, Metal sheet, Artificial veneer and leather etc. 5>  Acoustic tissue including: The black color and attached at the back side of acoustic panel tissue, has fire retardant and sound absorption function. About Tiange Foshan Tiange Acoustic and Deco Materials Co.,Ltd. *The Biggest Manufacturer of Producing Acoustic Panels,Movable partition and Soundproof Products in China. *To provide Designs,Materials,Engieering Whole System Supplier. *For The Global 90 Million User to Provide Quality Services. *Main Products:Grooved wood acoustic panel,Perforated wood acoustic panel,Movable partition,Acoustic QRD Diffuser diffuser,Fabric acoustic panel,Space sound absorber, Polyster acoustic panel,Acoustic wall panel,wood wool acoustic panel, Acoustic ceiling,   Soundproofing insulation material, acoustic soundproof , sound absorption panels and relative acoustic accessories.If you want to know more informations,we are online waiting you, Thank you!