The auditory system, the sensory system for the sense of hearing
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Ususally every receiver comes with a mic that you hook up to the receiver right after you hook up all the speakers and the sub. If your receiver doesnt already sense that the jack is in you may have...
Its the most common type of sound system used in homes. It consists of a Sub-Woofer for bass effect and 2 speakers to produce a surround sound.