EGG CRATE FOR SOUND REDUCTION: Which is more effective? Cardboard or Foam?

Some people use an affordable way to reduce sounds in their room and sometimes, they recycle some item to save money. One of the recycled items that are usually used for sounds reduction is card board egg crates but the question is, is this material effective?
              
Cardboard egg crates does not absorbs or reduce sounds fully. It sometimes depend on the frequency range of the sounds however, there is a modernized type of egg crates that can absorb and reduce sounds in your room which is called "Egg Crate Convoluted Foam"
              
This material is made by imported high quality and sound absorbing foam, high density acoustic foam cell structure for maximum noise absorption and helps to flutter echoes and reduce excess reflections and reverberation.
                              
To know more about Egg Crate Convoluted Foam, Visit Arrowzoom website and Use this code: AZ-ECRATE to get 10% discount on this collection!