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Input interface: USB digital signal, IPOD signal, coaxial digital signal >> Output interface: Unbalanced left and right analog signals, balanced left and right analog signals >> Signal to noise ratio: >115dB Frequency response: 20Hz-20KHz texture of material: aluminium alloy Product size: 230x378x88mm Product weight: 4.5kg Other performance: Two digital filtering modes are available; Adoption date >>