The SD-CD3 is a tube signal buffer that softens the shrill， thin sound from many of today's digital sources and restores the rich harmonic content that makes music sound lively and natural. Other highlights: ? High input impedance and low output impedance using cathode follower output based on two dual triode signal tubes. ? Audiophile Philips MKP coupling caps， audiophile electrolytic capacitors and precision metal film resistors used throughout ? High quality RCA input jacks Technical indicators:● Input sensitivity:-0.68dB (1kHz) ● Frequency Response: 10Hz ~ 100kHz (-0.1dB) ● Distortion: ? 0.03% (1kHz) ● Input impedance: 100K ● SNR: ? 60dB (A) ● Tube: 6N8P × 2● Volume: (L) 200mm X (W) 170mm X (high) 125mm ● Weight: Approximately 3.3 kg