Blue Jeans sells starquad cables but does not recommend them for unbalanced applications. This is a long-ish excerpt of why.
“If, on the other hand, we were to use an unshielded twisted pair to convey signals in an unbalanced circuit, figuring that twisted pair cables provide common mode noise rejection, we'd get a rude surprise. Common mode noise rejection won't work in an unbalanced circuit, because we're not getting signal current flow in the ground conductor; meanwhile, by dispensing with a shield, we've given up the only protection that an unbalanced circuit can provide against noise.
Confusion of these concepts is fairly common, and understandable. One will often hear in audio discussions that "twisted pairs provide superior noise rejection," because it's often assumed that it is the cable construction itself, rather than the equipment circuitry, that accounts for common mode noise rejection; as we've discussed above, it's really the combination of the two which account for the phenomenon.
This misconception sometimes leads to people using shielded twisted-pair balanced audio cable as an unbalanced interconnect; they will ground one of the two signal wires at both ends of the cable, and then ground the shield--sometimes at both ends, but sometimes only at one end, causing a loss of shield effectiveness.
The problem with this sort of construction is that it dramatically increases the capacitance of the cable by adding the shield to the one side. Instead of just the capacitance between the two conductors, one now has the total of (1) the capacitance between the two conductors, and (2) the capacitance between the signal wire and the shield. As capacitance in audio cable is very definitely an enemy, this is a serious sacrifice to make, especially when there is no noise rejection benefit.
Coaxial cable, not twisted pair audio cable, is the right choice when connecting unbalanced components.”