There is almost no difference between WE300B PLUS/WE845 PLUS and the ordinary style in the aspects of basic structure, main electrical characteristics, and this time we mainly upgrade the key materials and apply the new patented technology in the aspect of overall audio calibration, our expected goal is to make some significant improvements in the aspects such as presence, degree of sound purity, quietness of sound background, width-depth ratio of sound stage, extension on both sides and so on but maintain the fantastic sense of music of the original vacuum-tube amplifier, in order to realize the substantial development from HIFI to HI END.