Very bright SC and IC with coherence in imaging, soundstaging and timing

I have a new speaker with a 2“ BMR driver that handles everything from 250hz to 20khz. Naturally it can’t produce high frequencies as present as the mids. It needs +3db from 10khz on. No, I don’t want to look for a new speaker because I love for all other qualities.

Is there a speaker cable / interconnect that brings more treble energy yet still does not mess with timing (coherent speed), imaging, fullness and soundstaging ?

Up to 500 usd used, 8-10ft, black or clear color, round cables (no ribbons), sturdy, no boutique manufacturers, no diy. I usually prefer solid core over litz cables.

For 40w tube amp power

Thank you!