... headphone impedance: 16-64Ω4. harmonic distortion: THD + N: <0.001%5. signal to noise ratio: 105dB6. Channel separation: 102dB7 ... circuit.2.independent professional circuit design, cost-effective portable headphone amplifier, perfect sound quality.3.TI, HIFI level by the ... professional audio jack, plug flow, to ensure that the source 0 decay.9.TOSHIBA (Toshiba) charging diodes, stable and efficient ...