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and fidelity can be judged by measurements and they all measure pretty much flat. Unless engineered to have a certain sound (I.e. Not for high fidelity) the differences will be surprisingly small, and mainly come down to differences in output voltage making one slightly louder (and thus subjectively better sounding) than another or differences in filtering and output stages. They do sound slightly different, but it's pretty subtle and you may not be able to pick the difference in a blind test once volume matched.