The first impression one gets from a microwave is the sound of its door closing. This is a determining factor that can define one’s image of the products’ overall quality. It is, therefore, very important to provide a smooth closing door, where low frequency content, also known as ‘boominess’, is predominant over abrupt high frequency tonalities that can be intrusive. On those microwaves which provide what is known as a ‘cooling off’ period after the main functionality has finished, efforts should be focused on reducing the decibel levels of this phase, as is out of the user’s control and can become annoying.