Used Headphone amplifiers

Fosi Audio K7

Display, Bluetooth

FiiO K11

USB-DAC, Display, gain switch

FiiO KA11

USB-DAC

iFi Audio Zen Dac 3

Bass Boost, USB-DAC

FiiO JA11

USB-DAC

FiiO KA17

USB-DAC, gain switch

FiiO K7

USB-DAC, gain switch

FiiO K11 R2R

USB-DAC, Display, gain switch

iFi Audio hip-dac 3

USB-DAC, gain switch

FiiO K13 R2R

USB-DAC, Display, Tone control, gain switch, Bluetooth

iFi Audio Go link Max

USB-DAC

iFi Audio GO link

USB-DAC

FiiO K15

USB-DAC, Tone control, USB host, Display, gain switch, Bluetooth

FiiO QX13

Display, USB-DAC

FiiO BTR15

Microphones, USB-DAC, Tone control, Display, gain switch, Bluetooth