Ah, resistence; this is for many audio neophytes a confusing subject, and rightly so. "Ohm's law states that the current through a conductor between two points is directly proportional to the potential difference across the two points." In layman's terms, resistence affects the amount of current drawn. If you lower the resistence and change nothing else, you will draw more power.
The downside here is that you may overheat your amplifier if it is not rated for a particular resistence. This happens all the time in car audio, where complete idiots put four woofers down to a half-ohm load on an amplifier rated for four ohms bridged, and proceed to set it on fire, blow fuses, and otherwise cause expensive mayhem.
If you are finding that the volume is not high-enough when you are impedence matching, you can get around it by tricking the amp into thinking it is receiveing a lower impedence than it actually is - in this case 16 versus 32. This is unlikely to cause any issues given then very low wattage drawn by headphones, but be aware that running amplifiers at a lower impedence than intended can cause overheating or distortion (though in this case it seems highly unlikely).
I'd check and make sure you've got all the volume settings turned up before changing the impedence, meaning the OS volume, driver volume, application volume, and any in-line volume that might be present. Then I'd go for a workaround if absolutely necessary.
Good luck,
Boz
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