BOOST IT
If you’re looking for a little audio boost in a miniature package, the new A1 headphone amp from FiiO might be one option worth considering. Small in stature, but grand in performance, the A1 has four EQ modes, hardware bass boost settings to suit your music tastes, an in-built 160 mAh battery with approximately 13 hours of run time, and an LED light to display battery charge.
SOURCE/PHOTO: FiiO