i'd get rid of the richard grey & buy a decent set of power cords. lots of 'em out there. review the threads & take your pick.
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I don't have a Richard Grey Power Company 400S. So, I can't advise on the benefits of replacing the stock power cord. But, I would suggest that you try a few power cords and hear for yourself. Several manufacturers offer a 30-day money back garauntee. You can also try the lending library at The Cable Company; they do charge a non-refundable deposit - which can be applied toward a purchase.
I have a Richard Grey power co. & it made a siginicent improvement for my system. As to the effects of power cables I aggre with Gallaine, all of these issues are system dependent and very subjective. I auditioned several power cords with my Power CO. & ended up with a Straight Wire, the same may not work for you. Just experement until you find something that YOU like.