An amp’s function is to amplify, rather than color, sound. Ideally, it won’t distort the headphones’ intended sound signature. Simply put, amps receive power from a source (e.g. an outlet) and use that to move the drivers. Some headphones require more powerful amps than others. Generally speaking, low impedance, high sensitivity headphones won’t benefit much, if at all, from an amplifier. A common rule of thumb in the headphone world is that low impedance = less power needed to drive the headphones. However, the relationship between impedance (measured in ohms) and sensitivity (measured in db/mW, sometimes db/mV) determines what wattage is required to power the drivers.
Plainly said, no, an amp should not influence or distort the sound. Really, amps just amplify, allowing us to hear their intended signatures.
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