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Well, once you've done the other things and if one of the things you're trying to optimize for is quiet/silence (below ambient noise level) then you try things like stacking fans on the pull side. You might get a better noise / static-air-pressure balance than if you simply raised voltage to the fan.
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True... true... In terms of combatting noise, it could be a worthwhile additional investment. In any case, if it works, it works!