MID-RANGE AND EXTENDED-RANGE SPEAKERS
The mid-frequency loudspeaker is supposed to have a good response at the frequencies located between those covered by the woofer (low-frequency speaker) and the tweeter (high-frequency speaker). However, some extended-range speakers can be used as general purpose units. An adequate general purpose speaker, Fig. 4.20 must have good response at both the low and the high ends of the audio range, not to mention in the middle.
Tests by various manufacturers reveal the following data: A 15 inch diameter loudspeaker will give excellent low-frequency response but will be sadly deficient in the highs. A 12 inch diameter unit will still give good low-frequency response, halfway decent middle frequency response, but ...
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