Features: Use linear push-pull circuit. Improved tube 5881A for output. With earphone jack. Output Power: 23W x 2 (4ohm-8ohm). Frequency Response: 6Hz to 70KHz (-2dB). THD: less than or equal to 5%. SNR: more than or equal to 78dB. Input sensitivity: less than or equal to 250mV. Input Impedance: more than or equal to 20K ohm. Vacuum Tube: 4 X 5881A, 4 X 6N1. Dimension: 465 x 455 x 305 mm. Gross Weight: 18.00kgs