Used Headphone amplifiers

FiiO KA11

FiiO K11 R2R

FiiO K7

iFi Audio GO link

iFi Audio Zen Dac 3

Fosi Audio K7

FiiO JA11

FiiO K11

Mackie Hm-4

iFi Audio Go link Max

FiiO BTR17

FiiO KA11

iFi Audio hip-dac 3

FiiO K7 BT

BOSS (Electronics) Katana:GO