The PS Audio P300's four outlets are really intended for "line-level" components only (e.g., CD transport, DAC, preamp). It's not a line conditioner, but a "power regenerator." Yes, mine runs hot (it's essentially a 150 wpc amp, after all), but doesn't hum, and its effect on system performance has been to transform cardboard images into palpable performers and instruments.
Power Line Conditioners
I am fairly uneducated to the power conditions although I currently use a Panamax 1000+ in my system. Do all components need to go through the unit or simply the amps. I like the PS 300 but it only has 4 outlets. Please help me understand this subject better if you have the time. Thank you. Rick