7. Is the FT13 easy to drive? Can a regular phone drive it?

The FT13 has an impedance of 32Ω and a sensitivity of 98dB/mW@1kHz (113dB/Vrms@1kHz), making it quite easy to drive. It can be powered by most smartphones and computers. However, to obtain optimal sound performance, it’s recommended to connect it with a more powerful audio player or amplifier.