I'd be interested to learn if you find any benefit using the Starquad. From an engineering and application perspective, the benefits should only manifest in a balanced line connection (XLRs) and where the cable runs close to some or other very dirty power supply. Where you're using single-end (unbalanced) connections such as RCA plugs there isn't the opportunity to use the offset of the twin parallel geometry.
Also, if your existing cables were sitting in such strong and dirty magnetic fields as to need the benefits of balanced line and show an improvement with Starquad over ordinary balance line connections, then I think you'd hear the noise very evidently with single-ended cables. However, strange things can happen in Hi-Fi, and as you experienced in a way with the Chord demo, sometimes different is enough to convince people it's better, and folk have widely ranging opinions of what 'better' means.
If you're experimenting and fancy a go with some Van Damme Plasma Grade, I have some remnants you could have cheap. I also have some double-braid screened cables which are excellent for noise rejection, particularly at audio frequencies. There's a BBC cable I have where the shielding is insane.