Speaker cable to tame brightness?

[Womaz]

Ok I have always been a bit cynical about the effects a speaker cable can have, but in my attempts to try and tame the brightness in my system I may try this.
I have the tellerium q black at present and this is supposedly a good very revealing cable

Would it be worth trying a new cable that is not as revealing.?
A cheaper tellerium q option maybe.
Anyone know of any reasonably priced cable that could tame the brightness