I don't know if the BW controller uses phase control (often called chopping) to vary the voltage, in the same way as the CW-80, if so most common voltage/mutimeters will not give an accurate voltage reading. To get an accurate voltage reading from a phase control controller, you will need a TRUE RMS voltage meter. The "Brick" is probably putting out a pure sine wave current, which a common meter will read accurately, but the BW CONTROLLER is using phase control to adjust the voltage, which is confusing your meter, and causing the differences in output readings between the brick and the controller.
Doug
