I just added the SOtM mBPS-d2s Intelligent Battery Power Supply to power the SOtM tX-USBexp card of my custom Media Server.
I know that some will say this is redundant, that I don't need the SOtM tX-USBexp or the SOtM mBPS-d2s Intelligent Battery Power Supply because I am using the Berkeley Audio Alpha USB converter.
The Berkeley has its own independent power supply for its reclocking and depends on the incoming USB cable for its power, from the USB card of the Media Server.
The SOtM USBexp card in the Media Server is powered by the same power that goes into the Media Server, except if you connect the SOtM battery power supply,
then the SOtM USBexp card automatically switches to the battery power.
Over at the Computer Audiophile forum, some audiophiles have "observed" better sonics using the Red Wine battery power supply, and the SOtM battery power supply at only $420 is about 1/3 the cost of the Red Wine so I figured, heck, why not?
The SOtM battery power supply has a front switch to turn it on and off - must be in on position for it work. If its in off position, then the USBexp card works off the same power that
goes into the Media Server.
Mebbe I am being redundant with both the Berkeley and the SOtM USBexp card and battery power supply. I would rather call it cautious. :DBut it sure sounds good!