What a loudspeaker system is trying to do is to reproduce sound as accurately as possible without any unintended extras sound just pure original sound, only nothing else. Speaker enclosures make speakers work better. Try running a speaker without a box and see how tinny it sounds. Unfortunately, most speaker enclosures make some secondary, unintended sound, as the action of the speakers makes various parts of the enclosure vibrate. This extra sound is known as secondary color. Some of this secondary sound can be an annoying rattle, a booming resonance or worse, a set of very low frequency noises that are perhaps below the normal range of the human ear.
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