Coiling excess Speaker cable, is this a problem?

Hello!

I have a question that maybe you could help me with. I have been told that you should keep the lengths of speaker wire the same to each speaker. As a result, I have 2 (BiWired) cables going to each speaker, due to my system set-up, I have about 8' of two cables neatly coiled up next to my system rack. Though I am not detecting any sound reproduction artifacts, are there any potential deleterious problems I may not be aware of? I did take a photograph of this but I could not figure out how to paste it here.

Thanks for your help!