I don't care for the power conditioners I have used; the top PS Audio is suppose to be good but I haven't tried it. A good power cord will help but dedicated lines are the best investment.
I would have to say a good power conditioner for the reason that all of your components will benefit from the clean power. That said, if you are thinking about a PS audio ( I recently purchased this model) to get the best out of it you will have to buy a good power cord. Don't get me wrong it will improve the system with the stock cord but does require a quality cord to get the most out of it.
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