You can use it as a digital coax.. even ordinary rca cable will do since it's digital. For diy subcables i suggests that microphone cables is better than rg6 or rg59, because those cables use to carry very high frequencies and tends to attenuate low frequencies to avoid distortions of signal while microphone cables is for audio frequencies which is 20 to 20khz. Buy cables with good shielding since sub frequencies is more prone to interference.