mlo97 This won't work for everybody, but in my listening room I was able to get a dedicated power line for the audio system simply by making sure that there was nothing else on the circuit. The house is fairly new so had one dedicated 15-amp circuit for the lighting and another 20-amp for the convenience outlets in the listening room (originally a bedroom). With a little bit of testing and fiddling I was able to move a couple of the outlets from the convenience outlet circuit to the lighting circuit, which had very little other load on it. This allowed me to plug in my PC's power supply, an LED floor lamp near my listening position, and a cell phone charger without any of them being on the same circuit as the audio.
I also moved the now-dedicated audio circuit to the top breaker in the box by simply swapping its hot and neutral wires with the those of another circuit protected by the same size breaker. I'm not sure why having the audio system's breaker be the top one in the box should make a difference, but it wasn't much trouble to make the swap, and it was free.
Of course you should have some familiarity with domestic electrical work, or help from someone who does, to make such changes.