GelbeMusik
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As more amplification is comparatively expensive Vs changing drivers to higher efficiency, especially in a cubic volume limited design, we need to be shooting for drivers that are this or higher.
Common saying is that the efficiency is determined by volume and targeted low frequency extension. There are estimates for the required (avg/max) level over frequency:
https://www.hifi-selbstbau.de/images/stories/grundlagen/waveana/TrackAllAvg.png
Full page ( German only ):
https://www.hifi-selbstbau.de/grund...6/81-musik-qvergleichenq-mit-dem-waveanalyzer
The low frequency demand for amp pwr could be estimated like a 50Hz/12dB filter applied, which mimics the spectrum of real life content. There are exceptions like the spoken wisdom piece Usher / Yeah ...
Discarding that wisdom, the low frequency isn't that critical anymore when it comes to available watts. So, yeah, go for higher efficiency.