To quantitatively characterize the speaker, the frequency response curve is measured from 20 Hz to 20 kHz and compared to a commercial earphone of similar size Sennheiser® MX-400). The sound card in a laptop computer (SoundMAX® Integrated Digital HD Audio) is used to generate equal-amplitude sine waves, and a commercial condenser microphone (SONY® ICD-SX700) is used to measure the sound pressure level (SPL) at different frequencies. The software is Room EQ Wizard. (p. 8)
That's a hugely uneven frequency response.
I'll have to try a pair out, once graphene costs less than a million dollars an ounce.
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