A mid-range speaker is a device that covers the middle part of the frequency spectrum. Mid-range speakers cover the most important part of the audio spectrum, so they run from a range that goes from 500Hz to 4kHz. It’s worth mentioning that the human voice, as well as a wide variety of instruments, are positioned within this specific range. The reason for this is because the middle part of the frequency spectrum is quite perceptible and pleasant. Also, the human ear is extremely sensitive to the mid-range frequency, so the device can remain on low power while offering good sound quality and volume.
It’s worth mentioning that many devices, such as tweeters and woofers, include mid-range speakers. It’s essential for the reproduction of mid-range frequencies to be natural, uncolored, and detailed. It’s also important to avoid the sound to be excessively bright or dull. When the speaker’s mid-range output isn’t clear, both spoken dialogue and musical content will be turned as unnatural or even become imperceptible to the human ear. Therefore, mid-range speakers are an essential element of home theatre audio systems.
The nature of the drivers can affect the selection of both crossover frequency and slope. Almost all crossovers are passive circuits that mimic the peculiarities of the drivers and their configuration. Crossovers involve capacitors, inductors, and resistors. It’s worth mentioning that high-performance, hi-fi speakers, and professional sound reinforcement systems commonly have active crossovers or electronic crossovers.
Cone mid-range drivers are very similar to small woofers. Mid-range drivers can be classified as cone types, dome types, or compression horn drivers. The diaphragm of a cone mid-range driver involves a truncated cone with a voice coil. Most mid-range cones are made of paper, and sometimes they involve polymers or resins to improve vibrational damping. Other cones are made of a variety of plastics, such as polypropylene, Codex, Bextrene, woven Kevlar, fibreglass, carbon fibre, or light metal mixtures based on aluminium, magnesium, or titanium. The surface of a dome mid-range is usually made of cloth, metal or plastic film. Dome mid-range devices are located at the outer edge of the dome.
It’s worth mentioning that many professional concert mid-range drivers are compression drivers with horns, while some are electrostatic drivers, planar magnetic drivers, or ribbon drivers. Most small radios and television sets include a single mid-range driver. When a stereo sound is desired by the human ear, two mid-range drivers are involved. Both the driver and amp can work on low power, while still delivering a good sound both in terms of volume and quality. This is an essential element regarding both television and radio.