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.
Need Advice:Richard Gray and Power Cords
Is it overkill to replace the power cord on the Richard Gray 400S? Will there be any tangible improvement? If so, what reasonably priced power cord do you recommend?