Most high efficiency woofers are intended for live pro-sound use, either PA, electric bass or guitar or electric keyboards. For the most part those made for guitar and bass are extended range models and normally aren't paired with midrange drivers. Those intended for PA and keys are usually crossed over at far higher frequencies than hi-fi standards, and then usually to compression horns that have even higher sensitivities than cone drivers, for maximum output capability. This leaves very little demand for high sensitivity cone midrange drivers, and as with all things if the demand isn't there the supply won't be either. If you're looking for high SPL midranges for hi-fi use consider also full range frivers from Fostex, which make fine midranges when housed in small sealed boxes.
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