Hifiman EF500

gain switch

FiiO KA2

USB-DAC

iFi Audio Zen Dac 3

gain switch, USB-DAC, Bass Boost

iFi Audio Zen Can 3

Bass Boost, gain switch

FiiO BTR17

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

FiiO K17

USB-DAC, Display, USB host, Tone control, gain switch, Wi-Fi, aptX, Infrared, Airplay, Bluetooth

RME Audio ADI-2 DAC FS

Display

Lehmann Audio Drachenfels

RME Audio RME ADI-2/4 Pro SE AD/DA converter with microfibre cloth

Rupert Neve Designs Neve RNHP hoofdtelefoonversterker

Mackie Hm-800

gain switch

FiiO K11 R2R

USB-DAC, Display, gain switch

Art HeadAmp 6 Pro hoofdtelefoon amplifier

Bass Boost

Terratec HA-1 batch

Bass Boost, Powerbank

InLine Replacement Tube for AmpUSB HiFi DSD Headphone Tube Amplifier