Bài 5:
A lot of people like to play their records as loudly as possible. The result is that the rest of family and the neighbour often complain if they do not like the music. One answer to this problem is to wear headphones, but headphones are usually uncomfortable. An armchair which has a record-player system built into it has just been designed by a British engineer, Stephen Court.

The arm chair looks like an ordinary armchair with a high back. However, each of the two sides of the chair has three loudspeakers inside to reproduce middle and high sounds. Low sounds are reproduced by a pair of loudspeakers in a hollow space under the seat. Anyone who sits in the chair hears sounds coming all around his/her head.

​Because we can't tell the exact source from which low sounds come, it doesn't matter that they come from underneath or behind. It is the higher sounds coming from the sides of the chair that create a stereo effect. ​These sounds travel only a few inches to reach the listener's ears. Consequently, it takes only a little power to make the music sound very loud. Only a small amount of loud leaks out from behind the chair into the room to disturb others. Most of the sound is absorbed by the listener.
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