 The only similarity between the WTB1000 and the WTB400 and WTB700 was the single semi-parabolic control that could be turned on or off.Otherwise they were entirely different pre-amp and power sections.In 2010, the Nemesis cabs changed from being the EN series into 2 distinctly different series - The EX series replaced the previous EN series and the E-xxxXST series replaced the ENxxxXST series.