Any Info About MTX MR-408 Midrange?

[Loper23]

My friend picked up two MTX RoadThunder 4" Midrange speakers for $20. They are both 8 ohms rated for 100 watts RMS each (says so on the box). The model numbers are MR-408.

I can't find any further info about them beyond the ohms and wattage that's on the box. The boxes look old, but I may be wrong.

Does anybody have anything to share about them? What are they worth (both function)? What frequencies should I cross them over at? Are they even worth the trouble of installing (3-way active)? Why do the speakers have 3 terminals on each one?

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