Vacuum Tube Speaker with Stereo Input Interface Excellent circuit and fine component ensure good sensitivity Utilizes perfect circuit design for excellent sound effect Particular vacuum tube preamplifier Wooden box and iPod design style Stereo input interface Input sensitivity: H750MV,L200MV Rated load impedance: SW 4ohm, L/R 4 ohm Input voltage: AC220V; AC110V for option Max output power: SW 15W, L/R 6W x 2 Frequency response (-3dB): SW 50Hz-160Hz; L/R 100Hz-20KHz S/N: SW >75dB; L/R >80dB (A weighted) Harmonic distortion: SW <0.1% (1W input); L/R <0.05% (1W input) Channel balance: L/R +/-0.5dB Separation: L/R >50dB