Our ThoughtsThe SMSL SH-8 pairs well with the SMSL SU-9 and together they form a beautiful, powerful, and high-performing Amp & DAC combo for your headphone setup. The SH-8 may not be cheap, but it's an extremely high quality amplifier that is well worth its cost.IncludedSMSL SH-8 Headphone AmpSpecs Inputs: Unbalanced (RCA), balanced (XLR) Outputs: 6.35mm headphone jack, balanced headphone jack Unbalanced output: 32 ohms / 420 mW, 64 ohms / 377 mW, 150 ohms / 190 mW, 300 ohms / 100 mW, 600 ohms / 51 mW Unbalanced THD + N: 0.0009% Unbalanced SNR: 107 dB Balanced output: 32 ohms / 655 mW, 64 ohms / 835 mW, 150 ohms / 717 mW, 300 ohms / 400 mW, 600 ohms / 205 mW Balanced THD + N: 0.001% Balanced SNR: 109 dB Power consumption: 3.5 W Standby power: < 0.1 W Dimensions, W x H x D: 7.3 x 1.6 x 4.9 in (185 x 40 x 125 mm) Weight: 2.2 lbs (1 kg)