No, I did not even look at Allen's cable designs. I came up with the idea for mine by owning both the Anti-Cable SCs, and the ICs. Speltz SCs run separate. Mine do too. The Speltz ICs are run separate as well, the negative wire is a no-see-em that runs through straight.
Mine are made of all nines copper for the positive, and heavy duty aluminum for the negative. The ultra thin metals are sandwiched between Kapton. They are meant to run separate. This is just common sense to me.
The music signal is a delicate affair. They each produce a magnetic field. Why would we want the music signal crossed by a foreign magnetic field?
Why aluminum? It's because it works after it's function. The Apogee bass panel is split under the cover with the narrow band being the negative cable. I just extend the aluminum ribbon.
The resultant sound is breathtaking.
In eight days I get my neck rebuilt. Depending on recuperation, I will be back to stretching cable parts down my work table trough by and by.
I think you live overseas from me. If you do, I will tell you how to make cables yourself with email.