Dedicated lines. I have tried P.S. audio and Audience. I could not tell any difference. I use upgraded power cords and I can detect a slight difference. I read so much about power conditioning making such a big difference but I'm not hearing it.
Your experience mirrors my own. Once I ran dedicated circuits, it really helped clean up the sound. The background noise floor was lower, and the bass response was tighter and deeper. Adding power conditioning really didn't do a whole lot more, IMHO.
I use Audio Magic for my cdp and preamp. It's a wonderful addition combined with excellent power cords (I love mine..on all components) and dedicated lines for my digital and Porter outlets. Power conditionings is a mile long thread that has been on the 'gon many times. An expensive option to audition unless purchased used.
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