No, it's not just in your head the resulting sound quality when played back through good headphones would be the same.
Manufacturers usually indicate the diameter in millimeters of the drivers used to make their headphones. It is generally believed that the larger the diameter of the driver, the better the sound quality. This is especially important for bass.
Measured in decibels per milliwatt (dB/mW). For a given input volume, more sensitive headphones will sound louder. Generally, a difference of 3 dB/mW or more is considered audible to most listeners.
In the headphone datasheet, Driver gives the diameter of the membrane in millimeters. As a general rule, which isn't always true, bigger drivers give better performance, especially in the low frequencies.
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