An ordinary request to IEM tenderfoots is the explanation an IEM would require such innumerable drivers. The essential thing to know is that IEMs shouldn't for a second worry about masses of drivers to sound perfect. There are abundance that use one single driver and sound inconceivable. Some usage that various drivers since it allows each driver to practice and focus in on a particular repeat range that it prevails at. Using various drivers similarly allows the maker to align the sound and tuning to such an extent that is considerably more inconvenient with a lone driver.