![]() ![]() Using four subwoofers is preferable as you will get a better bass performance and will have less of a problem with standing waves, since the bass will originate from many locations in the room. However we must make sure that its position does not create standing waves. As a result we can get by with using only one subwoofer for bass reproduction. It is true that our ears cannot easily tell where the bass comes from. You must match the level of the subwoofer to the other speakers, so that the bass is not over emphasized.įinally you must position your subwoofer in the correct place. You must select the correct cut-off point for the low frequencies produced by the subwoofer. The subwoofer must be matched to the other speakers. Adding a subwoofer to your system must be done carefully. In addition if you use an active subwoofer, you will free up your amplifier’s power reserves, improving overall performance. The first reason is to add bass to a system whose main speakers lack good bass responseĪnother reason is to remove the bass reproduction requirement from your other speakers, which improves their performance by minimizing inter-modulation - that is the non-linear mixing of sound with different frequencies. There are many good reasons to add one and ideally two subwoofers to your system. It will enhance all low frequency output, plus it will allow your amplifier to perform at its best. What are the benefits to using an active subwoofer?.Since low frequencies are largely non-directional, the subwoofer reproducing them can be placed far from the main speakers and still sound as if they were emanating from them.įurthermore, if you have all the low frequencies coming from one speaker (the subwoofer) it can be placed in the most suitable part of the room to minimizes standing waves, thus giving a more uniform bass reproduction. As a result they behave more linearly, are more efficient, while at the same time are much smaller in size and of course less expensive. Thus the main speakers are released from the work of recreating low frequencies. Its task is to exclusively reproduce the lowest octave of the audible frequencies (20Hz to 80Hz according to the THX specifications, or up to 120Hz maximum for smaller main speakers). Speaker manufacturers therefore resorted to producing an independent unit called a subwoofer. The purpose varies according to the speaker placement and characteristics.īass reproduction places great strain on speakers. What is the purpose of each speaker in a home cinema system?.At 21 degrees centigrade the speed of sound in air is equal to 344 m/sec. The speed of sound through air is influenced by the temperature of the air, which affects air density. The speed of sound is measured in metres per second (m/sec) and is symbolized by the letter c. The speed of a wave indicates how fast it travels through the medium it propagates. Age and long-term exposure to loud environments reduce this range. Humans can hear sounds with a frequency between 20Hz and 20,000Hz (20kHz). ![]() One kHz is one thousand cycles per second. It is symbolized by the letter f and is computed in Hertz (Hz) or kilohertz (kHz). The frequency of an audio wave indicates the number of cycles generated in one second, which is how many times the audio wave repeats itself in one second. It is symbolized by the letter T and is measured in seconds (sec) or milliseconds (msec). Period is the time required by the audio wave to complete a full cycle, or to cover a distance equal to its wavelength. In physics the wavelength is symbolized by the Greek letter λ and is measured in metres. Wavelength is the distance the audio wave travels until it completes a full cycle and it starts repeating itself. According to the rules of physics, a wave is described by its wavelength, its period, its frequency and its speed. It may take the form of an elastic deformation or of a variation of pressure. This acoustic wave carries the audio information of the initial disturbance of the air caused by the loudspeaker, according to the rules of wave propagation.Ī wave is a disturbance or variation that transfers energy progressively from one point to another. Sound propagates through the air in the form of an acoustic wave. A loudspeaker converts the electric energy from the amplifier into acoustic energy we hear by moving air. It is generated by an audio source and is detected by human hearing. ![]()
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