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By Yuan M., Su C., Hu T.

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Usually there's a knob to change tweeter response, and in three-way or four-way systems, a knob or knobs to change the intensity of midrange response. The purpose of these controls is to permit the speakers to be "tuned" to the room in which they will perform and/or to the ear of the listener. ) There's no system so good that it can't be improved. Therefore minor adjustments to speaker and electronic component controls may easily create an improvement in overall sound. The listener should feel free to experiment until he arrives at the sound quality which suits both the environment and his own hearing.

LOUDNESS In audio, a term which usually refers to the principle (documented by Fletcher and Munson) that the response of the human ear to sound is not regular, but varies enormously with the intensity or loudness of the music. At very low levels both bass and treble frequencies seem to decline more than the midrange frequencies. Many audio amplifiers therefore have some form of loudness control which causes the amplifier to boost certain frequencies at low-volume playback. LOUDNESS CONTROL Ideally a loudness control should affect both high and low frequencies.

MOTOR The combination of magnet, its steel housing and the voice coil. These parts provide the power and the force to move the loudspeaker. N NEGATIVE FEEDBACK In general, feedback is the application of a portion of the output signal to the input signal of any system which has gain. The most common usage of feedback is in audio amplifiers, since distortion in the output signal of an amplifier can generally be reduced by feeding a percentage of the output signal back into the input of the circuit with polarity reversed (hence the term "negative feedback").

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A Central Limit Theorem for Random Fields of Negatively Associated Processes by Yuan M., Su C., Hu T.

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