... silver iBasso P4 Warbler 3CH/4CH Portable Headphone Amp amplifier Main Features:- ThreeChannel/ Four Channel compatible architecture- ... time with stock opamps (TLE2141 Class A*2, BUF634U*2, dummy adapter*2)- High output power, 600mW+600mW into 32 ... 2, OPA604*2, TLE2141 Class A*2, BUF634P WB*2, BUF634U*2, Transistor BUF*2, Dummy adapter*4) iBasso P4 Warbler 3CH/4CH Portable Headphone Amp amplifier ...