Installing ceramic or porcelain tile is both an art and a science. Tile installers must know the composition of the tiles as well as how to lay them in place attractively. Besides the normal costs of labor and materials, a tile project's costs vary by the type of sub-flooring to be used as a foundation for the tile.
Three things can cause an EMI problem: A signal source creates some kind of noise, there is a transmission path for the noise, and/or there is a receiver sensitive enough to be distorted by the noise, as shown in Figure 1.
This is why your ears pop. Sometimes people suffering from ETD get crackling noises in their ears or deafness. The deafness is usually temporary and is as a result of the normal flexible ear drum, or tympanic membrane, becoming stiff as a result of the increased pressure behind it. The ear drum is therefore unable to move when a sound wave hits it and so the sound is muffled when it is heard. The crackling is due to the mucus moving within the middle ear. It is the blockage of the Eustachian tube that causes pain in the ears when flying as the changes in air pressure make it difficult for the pressure across the ear drum to equalise. This causes the ear drum to be stretched, which is painful.