Just finished my kappa 9 infinities took apart looked like someone used cca in there.replaced the crossover and internal wire with 10 awg ofc.replaced the 2 woofers and it sounds great oak cabs. I think if you solder good wire on it won't hurt as an extension. I built a speaker cable out of 4 awg wire ofc and they sound great.i think my cardas gold reference is 4 awg. Enjoy the experiments and the music.