Tài liệu tham khảo về bài tập luyện thi tốt nghiệp THPT và tuyển sinh đại học môn tiếng anh. | A lot of people like to play their records as loudly as possible. The (1) is that the rest of the family and the neighbours often complain (2) they don't like the music. One (3) 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 (4) by a British engineer, Stephen Court. The armchair 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 (5) under the seat. Anyone who sits in the chair hears sounds coming from all round his/her head. Because we cannot tell the exact (6) from which low sounds come, it doesn't (7) that they come from underneath or behind. It is the higher sounds coming from the side of the chair that create a stereo effect. These sounds travel only a few inches to reach the listener's ears. (8) , it takes only a little power to make the music sound very loud. Only a small amount of sound leaks out from behind the chair into the room to (9) others. Most of the sound is (10) by the listener.
