High Efficiency Speaker Asylum

Need speakers that can rock with just one watt? You found da place.

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All Done by Magnets!

Posted by cawson@onetel.com on May 29, 2023 at 04:55:59:
You specifically ask about drivers, so ignoring the enclosure design (very important in its own right), the main influence on sensitivity of a driver is its magnet. A small current passing through the voice coil will move further and faster if it's contained within a powerful magnet. The closer to the centre of magnetic influence the better.

The further and faster the coil moves, the greater its sensitivity as the resultant sound vibrations that reach your ears will be louder for a given coil current.

Someone will almost certainly shoot down this explanation, but there we go!