Used: Headphone amplifiers

FiiO KA11

USB-DAC

FiiO JA11

USB-DAC

FiiO K11

Display, gain switch, USB-DAC

FiiO KA17

gain switch, USB-DAC

FiiO BTR17

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

IK Multimedia Arc On-Ear

Tone control

FiiO K11 R2R

Display, gain switch, USB-DAC

Fosi Audio K7

Display, Tone control, Bluetooth

Fosi Audio ZH3

Display, gain switch

Fosi Audio GR70 – Röhren-Kopfhörerverstärker / Hi-Fi-Vorverstärker – RCA-Eingang – Schwarz

Fosi Audio SK01 Kopfhörerverstärker und Preamp

gain switch

Fosi Audio K5 Pro

Bass Boost

iFi Audio GO link 2

USB-DAC

Fosi Audio MD3, 32Bit/384kHz DAC + Kopfhörerverstärker silver

Display

Fosi Audio GR40 Röhren-DAC – Kopfhörer & Preamp – USB/Opt/Koax

USB-DAC, aptX, Bluetooth