want to upgrade spkr cables

I have Rogue Cronus Magnum driving Reference 3A DeCapos. Current cables are single run, Kimber 4TC...fifteen foot runs. I have a used pair of double run Kimber 8TC, only 8ft runs and need to be reterminated. Currently not using them at all. Naturally, for an upgrade, I thought of Kimber 12TC. .Opinions and/or suggestions would be greatly appreciated.

PS... If it matters..I don't listen to much bombastic music. (except Mahler and Wagner once in awhile), but always at a reserved, polite volume.