A mid-range speaker can be a loudspeaker driver that reproduces a band of frequencies normally concerning 1–6 kHz, usually called the mid frequencies (amongst the woofer and tweeter). Mid-selection driver diaphragms is often product of paper or composite components and will be direct radiation drivers (somewhat like smaller sized woofers) https://gunnerwufsi.blogkoo.com/fascination-about-speaker-49368876