speaker cables with a warm sound

I was hoping to get some suggestions on speaker cables that have a dark, warm presentation. I am running a pair of NHT VT-1.2's. They are fairly revealing in my system and are punishingly bright with brightly recorded software. My ears are VERY sensitive to high frequencies and can quickly become fatigued with bright material. I have changed out my interconnects to Harmonic Technology Truthlinks because of their warmer sonics. That helped a lot. I think the addition of dark, warm speaker cables will get me where I want to be. Right now I am biwiring with a shotgun array of Music Metre Signature (4 single runs per speaker). The associated amp is a Sonic Frontiers SFS-40 (6922/KT-90), but I have a pair of SFM-160 monoblocks (6922/6550) on the way. Any suggestions would be greatly appreciated.