Those are MTX ThunderPros, they came from MTX's old school loaded full range subwoofer boxes that came with horn tweeters and midrange. They're entry-level and no they can't handle 750 watts, not even close... I wouldn't give more than 200 watts RMS to each. Do not play really low bass with these as they don't have the suspension travel and you'll bottom them out or rip the cone off the coil.
They're from the late 90s or early 2000s, MTX made them before they even had Thunder 4000s.