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Midrange drivers are speakers designed to handle the frequency band of about 250 Hz to 5000 Hz. Midranges are found in three- and four-way speaker systems where all the high frequencies go to a tweeter and all the lows go to the woofer or midbass driver.
Since a midrange driver is not expected to handle any lower bass program material, it doesn't have to be as big and it can handle more amplifier power. Midranges tend to be very directional, but not as bad as tweeters. Keep in mind that the ones crossed over from the woofer in the 250 Hz to 800 Hz range always adversely affect the voice reproduction.