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Capacitance and inductance will be way out of balance… there is a reason rcas have decent sized dielectric and low conductor sizes to get low capacitance and reasonable inductance and low resistance

 

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Is that coaxial cable? If it is, the 12 gauge sizing is likely the overall diameter, which makes this discussion pointless. If not, let us know if you get any noise. Twisted pair or coaxial is the best construction for rca cables in any case.

Not the op, I presume he has 12g speaker cables or something 🙈

the ones pictured look far smaller than 12g especially considering he has two cores in that little 4mm diameter bundle with dielectric as well

 

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Belden 1694a is approx $3 a meter, use that, excellent quality’s for rca cable, it’s very worth buying