To a close approximation doing that will double the cable capacitance that is seen by the component that is driving the cable, and it will cut the resistance and inductance in half. For a line-level interconnect conducting analog signals the most significant of those changes is almost certain to be the doubled capacitance. The resulting sonic difference, if any, will depend on the output impedance of the component driving the cable (especially its impedance at high frequencies), the length of the cable, and the characteristics of the particular cable type. And if there is a difference, it may or may not be for the better, depending on those variables, the sonics of the system as a whole, and listener preference.
IMO. Regards,
-- Al