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Impedance is not the only number to look at, guys. Lower impedance means your amp can output more power relative to a higher impedance. Sensitivity is how your headphone responds to that power. I.e., decibels (sound pressure) per watt of power.
A good amp helps any headphone that is being fed from a good source (DAC). The DAC is what changes the ones and zeroes in your digital files into an analog electrical signal that can be amplified to something to make your speakers or headphones actually move and make sound. A crappy DAC means the whole rest of your chain is built on a weak foundation. You don't need to spend crazy money but you should have a decent one if you're thinking of dropping four hundred bucks on a pair of headphones.