InPol EAR, headphone amplifier and preamplifier4 line inputs RCA and balanced XLR, pre output inverting and non invertingS/PDIF and USB “B” type port digital inputs optional (HiDac Mk2 required)Dimensions: unit 37,8 x 28 x 17 cm, package 40 x 40 x 30 cm - Weight: net 12 Kg, gross 15 Kg..