The 2 inch Studiofoam Wedges are the most popular foam plates and the best all round absorbeerders! You can use them to small to medium sized areas including vocal booths, control rooms and sound Studios. They effectively eliminate standing waves and flutter echoes.
In addition, you can use them in combination with LENRD or Venus Bass Traps or Sunburst Broadband Absorbers. So you effectively tames the entire frequency spectrum in virtually any room. The 2 inch acoustic studio foam is the material of preference if you tune your room itself without the help of a professional acoustic specialist.