More coils does not change efficiency. Efficiency is a product of the design of the overall motor (coil thickness, height, gap length and tightness, just for starters) , and beyond the first couple hundred watts doesnt actually mean a lot anyways.
If the driver is rated properly you can feed it as dirty of power as you wish with no issues, assuming your impedance sweep does not make the amp put out more than what the driver is rated at if you're using a full-on square wave.
Most drivers are not rated properly and most amps are rated even worse.
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