No two people are alike, which is especially true in the case of how the human ear perceives sound. Despite this, manufacturers have little choice but to market headphones and earbuds using the “one size fits all” approach, relying upon the generally inadequate EQ settings built into mobile devices to help tailor music to individual listeners.

Wired for sound

Available in silver, black, or gold, Aumeo ($199, available on Amazon) is a small square gadget that processes audio output from your smartphone or other source and tweaks it to sound better on any pair of wired headphones. Measuring a diminutive 2.17 x 2.17 x 0.47 inches and weighing only 54 grams, the device provides up to six hours of playback when used wirelessly, or as much as eight hours when used with a wired source.
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https://www.techhive.com/article/3186384/consumer-electronics/aumeo-review-headphone-processor-creates-smartphone-audio-specifically-tailored-to-your-ears.html