To claim that a 32ohmm set of drivers 'uses less power' is misleading.
Similarly, to claim that a 32ohm set of drivers will produce lower SPL is just as misleading.
The only number that will give you any clue was to the SPL these things are capable of is their sensitivity.
A 32ohm driver will draw half the power as a 16ohm driver. This does not make it any more or less efficient. If that 32ohm driver has a sensitivity of 99db, and the 16ohm driver's is 96db, then (all other things being equal) for any given voltage, the SPL output will be identical, but the 32ohm driver will be seeing half the power. Specifically, it will be seeing half the amperage.
What's better for a smartphone? I'm not sure. I don't know the details of the amps they put in those things. If you're limited more on amperage than on volatage, then a higher impedance is preferable. Flip it around and the reverse is true.
Example: Several sets of headphones exist in two different ohm ratings. Sennheiser does this for some of their products. They sell 600ohm versions of phones that are meant for high-end broadcasting gear, which have no issue producing the high voltage required to drive them. The significantly less resistive models are more popular in the DJ and Production world, where the gear has no problem delivering amperage.
All other things being equal, you'll be doubling your volts to get the same sound from a 32ohm driver over a 16ohm driver. You won't be using any more or less power, but you will need more volts.
Sensitivity, power, and impedance are all different numbers that mean very different things, and so far, no one in this thread seems to understand that.
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