The back of the H15 has separate sections for the various components connected to it. For instance, the Amp/Subwoofer section is separate from the AVR/Preamp section. Each section is optimized for the type of component you have plugged in. The top row of receptacles is best for digital gear as it is the most sensitive to voltage fluctuations while the Amp/Sub section is set up with a high current filter. As far as it goes they are separated by various filter circuits but they all get power from the same source.