The ST-PH1 is a stereophonic phono preamplifier. Each of the two channel circuits is identical. The ST-PH1 has standard 47 k? impedance unbalanced phono cartridge inputs. Equalization follows the RIAA curve. Each output is capable of driving balanced or unbalanced, high or low impedance loads.FeaturesStereo or Mono Phono PreamplifierBalanced or Unbalanced OutputsOutputs Drive Hi or Low Impedance LinesAccurate, Low-Noise PreamplificationAdjustable Left and Right Output LevelsRDL(R) SupplyFlex(TM) Power Input Configuration