FiiO Q11
gain switch, USB-DAC
FiiO KA2
USB-DAC
iFi Audio uno
USB-DAC, gain switch
iFi Audio ZEN CAN Signature
gain switch, Bass Boost
iFi Audio Zen Dac 3
gain switch, USB-DAC, Bass Boost
iFi Audio ZEN CAN Signature MZ99
gain switch
iFi Audio Zen CAN
Bass Boost, gain switch
iFi Audio hip-dac2 gold edition
iFi Audio xDSD Gryphon Case
iFi Audio ZEN Air CAN
iFi Audio NEO iDSD 2
Display, USB-DAC, Bluetooth
iFi Audio ZEN Air DAC
gain switch, Bass Boost, USB-DAC
iFi Audio ZEN One Signature
USB-DAC, Bluetooth
Zoom ZHA-4
SpeaKa Professional Headphone amplifier
Bass Boost
