Ibasso amp2 four channel architecture with current feedback buffer amplifier card the ibasso amp2 four channel architecture with current feedback buffer amplifier card is a headphone amp designed to be used with ibassos dx200 dap offering a wider soundstage and added power to the outputs left right input ground output ground comprises the four channels architecture the design of the amp2 eliminates ground current interference which improves the sound purity nichicon fw audio aluminum electrol