<https://audiophilestyle.com/forums/topic/4735-lengthy-primer-on-ac-with-some-thoughts-on-reducing-the-computer39s-impact-on-yours/#comment-56228>
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"Dirty AC is imo an important source of audible pollution.  I've played around with regenerators, which opened my eyes to AC noise.  I once had several Elgar conditioners (a halfway regenerator on which Accuphase conditioners are modeled) and heard improvements adding Elgars in series ... to three in total.  Wow, was my response: that delicate thing called the audio signal is sensitively vulnerable to modification by very low-level noise. \n  \n"
<https://audiophilestyle.com/forums/topic/4735-lengthy-primer-on-ac-with-some-thoughts-on-reducing-the-computer39s-impact-on-yours/>