Your brightness is due to the Amp and your source.Cables will only mask the problem but wont fix it.Take the money you would spend on cables add it to what you can get for your source and upgrade the source first.
need help with choosing right cables
my system sounds bright.im sure cables are the problem.im using monster 950i innerconnesct and monster biwire speakercables.looking for more of liquid sound with out breaking the bank. my set up: b&k725amp denon333avr msb linkdac3 feeding pioneer333 as transport with monitor audio silver5s speakers.thanks to those who respond.trip